Solar wind enveloped Earth, claims NOAA. Here’s what has happened so far

Solar wind enveloped Earth, claims NOAA. Here’s what has happened so far… The National Oceanic and Atmospheric Administration has classified the solar storm as G-1 or ‘minor’. 

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  • The American agency confirmed that the phenomenon lasted for a few hours and slightly unsettled the Earth’s magnetic field

#space #solarflare #solarwind #spaceweather #solar #storm

As per the National Oceanic and Atmospheric Administration (NOAA), a dense stream of solar wind enveloped the Earth late on 14 July, but no notable impact was observed as the phenomenon wasn’t particularly powerful on the space weather scale.

The American agency confirmed that the phenomenon lasted for a few hours and slightly unsettled the Earth’s magnetic field.

The solar storm passed through the planet at 16:41 UTC (22:11 IST) with a geomagnetic K-index of 4. The K-index is used to characterise the magnitude of geomagnetic storms, and a level of 4 indicates minor disturbance, as per the NOAA alert.

The US agency stated that weak power grid fluctuations happened due to the solar storm, and expected auroras to be visible at high latitudes such as Canada and Alaska. However, the local US media has not reported any such sightings.

All about the solar storm

The massive solar storm, which moved towards the Earth at a speed of 1.6 million kilometres per hour, was supposed to hit the Earth last week, following which a power failure around the globe was expected, according to

“THE SOLAR WIND IS COMING: Later today, a high-speed stream of solar wind is expected to hit Earth’s magnetic field. Flowing from an equatorial hole in the sun’s atmosphere, wind speeds could top 500 km/s. Full-fledged geomagnetic storms are unlikely, but lesser geomagnetic unrest could spark high latitude auroras,” the said.

The National Oceanic and Atmospheric Administration has reportedly classified the solar storm as G-1 or ‘minor’.

What are geomagnetic storms?

A major disturbance of Earth’s magnetosphere, which occurs when there is a very efficient exchange of energy from the solar wind into the space environment surrounding Earth, is known as a geomagnetic storm. The storm is the result of major changes in the currents, plasmas produced by solar winds, as per the NOAA.

The most powerful geomagnetic storm ever recorded resulted in the 1859 Carrington Event, when telegraph lines electrified, zapping operators and setting offices ablaze in North America and Europe.

To create a geomagnetic storm, a solar wind has to sustain high speeds for a long period of time, which transfers the energy of the wind into Earth’s magnetic field.

The fierce and largest storms that result from these situations are associated with solar Coronal Mass Ejections (CMEs) where billions of tons of plasma from the Sun are hurtled towards planets that also reach Earth. While coronal mass ejections take days to arrive at Earth, some have been observed to arrive within 15-18 hours of being ejected from the Sun.

SpaceX’s INSANE New Starship LEAKED by Elon Musk

#Space #spacex #starship #starship2.0 #moon #mars #Leak #Elonmusk

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Deep in the heart of South Texas, Elon Musk’s SpaceX is hard at work creating the next generation of space travel. Called Starship, their top-of-the-line, one-of-a-kind spaceship is unlike any other that has come before it. It will be 30 feet in diameter, 180 feet tall and powered by the trademarked Super Heavy launch vehicle, which will propel Starship into space with the assistance of 31 Raptor engines. With the Starship and the Super Heavy combined, the craft will be the tallest, heaviest and most powerful space rocket that has ever graced the stars.

But the creation is more than just a record-breaker. Perhaps the most amazing thing about Starship will be the fact that it’s totally reusable unlike the spaceships of yesteryear created by NASA. The ability to reuse this ship is really what sets it apart and will make it much more financially enticing for SpaceX and any other space agencies.

To call Starship a modern marvel of engineering would be an understatement. It really does set the bar high for the future of flying through space. Generations of spaceships and prototypes have all led up to this creation.

And yet, Elon Musk isn’t satisfied with Starship. Even though his company is producing something revolutionary and ahead-of-its-time, Musk is already looking ahead to the next iteration of Starship. In fact, he has recently hinted at the concept of an even bigger Starship model, as well as special variants of the ship that would be capable of point-to-point travel on Earth, cargo shipments, and trips to the moon and Mars.

Why God is still the best scientific theory to explain our life on Earth

Physicists are increasingly coming to the conclusion our universe was intelligently designed…

#space #intelligentdesign #universe #unexplained #god

Earth from space with stars
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Can aliens explain both the origin of life and the fine tuning?

Aliens are in the news again. In June, a Navy report could not rule out the possibility that “unexplained aerial phenomena” spotted in our atmosphere were visitors from outer space. In January, Harvard astronomer Avi Loeb claimed an alien spacecraft had actually swept through our solar system in 2017 — and more are coming. Loeb later doubled down, suggesting that UFOs spotted by the military could be spies sent to gather intelligence about our life on Earth. 

As crazy as it all sounds, scientists have long posited the possibility of aliens on our planet. In fact, Francis Crick (who along with James Watson won the Nobel Prize for discovering the structure of the DNA molecule) once theorized that life on Earth was “deliberately transmitted” by intelligent extra terrestrials. Far from being scorned, Crick’s “Directed panspermia” theory was presented at a conference organized by Carl Sagan in 1971 and later published as a scientific paper. 

Scientists took this idea seriously because even the simplest living cells aren’t simple at all. 

Watson and Crick discovered that chemical subunits in DNA function like letters in a written language or digital symbols in computer code. As Bill Gates explains, “DNA is like a computer program, but far, far more advanced than any software we’ve ever created.” 

Evolutionary biologist Richard Dawkins echoes this assessment, noting the “machine code of the genes is uncannily computer-like.” In a recent tweet, he confessed to being knocked “sideways with wonder at the miniaturized intricacy of the data-processing machinery in the living cell.” 

The presence of information in even the simplest living cells suggests that intelligent design played a role in life’s origin. After all, we know computer programs come from programmers and information generally — in a book or newspaper, for example — always arises from an intelligent source. 

Perhaps for this reason, Dawkins once acknowledged the cell might contain a “signature of intelligence” — and attributed the source of that intelligence to alien intervention. As he mused, “it could be that somewhere in the universe, a civilization evolved . . . [a] high level of technology and designed a form of life that they seeded onto this planet.” 

But invoking an alien intelligence as the source of life on Earth does nothing to explain how life, and the information needed to produce it, first arose elsewhere. “Panspermia” just kicks that ultimate question out into space. 

In addition, no alien being within the universe can explain what scientists have discovered about the structure of the universe

Since the 1960s, physicists have learned that we live in a “Goldilocks universe” where the fundamental parameters of physics have been finely tuned, against all odds, to make life possible. Even slight alterations in the values of key factors — such as the strength of gravity or electromagnetism or the masses of elementary particles — would render life impossible. 

Consequently, many scientists think this fine tuning points to a cosmic fine-tuner or “super-intellect” as Cambridge astrophysicist Sir Fred Hoyle famously put it. Moreover, the fine-tuning parameters were set at, or soon after, the beginning of the universe, long before any alien intelligence could have evolved or acted to determine them. 

Can aliens explain both the origin of life and the fine tuning? Probably not. Explaining both these mysteries requires an intelligence who can act within the universe (to produce the code necessary to life) and also act on the universe as a whole from the beginning (to establish its finely-tuned structure). 

Believers in this kind of intelligence greatly outnumber believers in alien astronauts. They have long called this intelligence behind life and the universe by a different name. 

They call it God. 

A Major X Class Solar Flare Just Slammed Into Earth

#Xflares #SolarFlares #space #spaceweather #sun #solar

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A Major X Class Solar Flare Just Slammed Into Earth

NASA’s Solar Dynamics Observatory captured the flare on July 3. NASA/SDO

The strongest solar flare seen in four years erupted from the surface of the sun early Saturday and smacked into our planet’s atmosphere eight minutes later.

An explosion from a new and unnamed sunspot produced the X-class flare, the first of solar cycle 25.

The blast of x-rays traveled toward earth at the speed of light, colliding with the top of our atmosphere and causing a shortwave radio blackout over the Atlantic ocean and coastal regions. The below blackout map shows where radio operators may have noticed the weirdness around 10:30 a.m. ET

The map shows where the blast of x-rays from the solar flare impacted the atmosphere the strongest. NOAA/SWPC

Astronomer and space weather watcher Dr. Tony Phillips says the sunspot that produced the X1.59 flare appeared suddenly, like a cloudless day that quickly turns stormy.

“Yesterday it did not even exist, highlighting the unpredictability of solar activity,” Phillips writes at “More flares may be in the offing, so stay tuned.”

There appears to be little risk of an accompanying coronal mass ejection (CME) with this flare. A CME is a burst of hot, charged plasma that often occurs alongside a flare. The particles from a CME can take a few days to reach earth and cause additional interference with radio and electrical systems when they arrive.

Fortunately, the sunspot that produced this flare was on the edge of the sun’s face, making it unlikely that a CME would be directed towards Earth.

Solar flares are classified by their X-ray brightness as A, B, C, M or X with A being the smallest and X being the brightest and largest. This was the first X flare tossed off by the sun since a new solar cycle began in December 2019.

The sun undergoes an approximately 11-year-long activity cycle in which it swells to a peak at the middle of the cycle and then begins to quiet down until the end of the cycle when it all repeats.

While this is the first major flare of the young solar cycle, it measured just a X1.59, when the last solar cycle gave us a far more powerful X9 flare in 2017. All this means it’s worth heeding Phillips’ warning that stronger flares are likely on the way in the coming months.

In the past strong flares and CMEs have produced widespread power outages and communications blackouts. There is some concern that we are overdue for a catastrophic solar storm which could do unprecedented damage to power grids on the ground and the record number of satellites now in orbit, potentially crippling systems on the ground that rely on satellite communications.

Solar Flares: What Does It Take to Be X-Class?

Solar flares are giant explosions on the sun that send energy, light and high speed particles into space. These flares are often associated with solar magnetic storms known as coronal mass ejections (CMEs). The number of solar flares increases approximately every 11 years, and the sun is currently moving towards another solar maximum, likely in 2013. That means more flares will be coming, some small and some big enough to send their radiation all the way to Earth.

The biggest flares are known as “X-class flares” based on a classification system that divides solar flares according to their strength. The smallest ones are A-class (near background levels), followed by B, C, M and X. Similar to the Richter scale for earthquakes, each letter represents a 10-fold increase in energy output. So an X is ten times an M and 100 times a C. Within each letter class there is a finer scale from 1 to 9.

SOHO captured this image of an X28 class solar flare erupting on Tuesday, October 28, 2003.

The Solar and Heliospheric Observatory (SOHO) spacecraft captured this image of a solar flare as it erupted from the sun early on Tuesday, October 28, 2003.Image Credit: ESA & NASA/SOHO› View larger

The Halloween solar storms of 2003 resulted in this red aurora visible in Mt. Airy, Maryland.

The Halloween solar storms of 2003 resulted in this aurora visible in Mt. Airy, Maryland.Image Credit: NASA/George Varros› View larger

C-class and smaller flares are too weak to noticeably affect Earth. M-class flares can cause brief radio blackouts at the poles and minor radiation storms that might endanger astronauts.

And then come the X-class flares. Although X is the last letter, there are flares more than 10 times the power of an X1, so X-class flares can go higher than 9. The most powerful flare measured with modern methods was in 2003, during the last solar maximum, and it was so powerful that it overloaded the sensors measuring it. The sensors cut out at X28.

The biggest X-class flares are by far the largest explosions in the solar system and are awesome to watch. Loops tens of times the size of Earth leap up off the sun’s surface when the sun’s magnetic fields cross over each other and reconnect. In the biggest events, this reconnection process can produce as much energy as a billion hydrogen bombs.

If they’re directed at Earth, such flares and associated CMEs can create long lasting radiation storms that can harm satellites, communications systems, and even ground-based technologies and power grids. X-class flares on December 5 and December 6, 2006, for example, triggered a CME that interfered with GPS signals being sent to ground-based receivers.

NASA and NOAA – as well as the US Air Force Weather Agency (AFWA) and others — keep a constant watch on the sun to monitor for X-class flares and their associated magnetic storms. With advance warning many satellites and spacecraft can be protected from the worst effects.

Methane Detected at Saturn’s Moon May Be of Biological Origin

Here we go again: biology or unknown abiotic process?

#Enceladus #Space #Extraterrestrial #Solarsystem #Saturn

An artist’s rendering of gaseous plumes emanating from the southern pole of Enceladus. (NASA/JPL-Caltech)
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An international scientific team led by Antonin Affholder from the University of Paris in France wanted to know whether the gases emanating from Saturn’s moon Enceladus are likely of chemical or biological origin. During close fly-bys of the moon ending in 2015, the Cassini spacecraft detected hydrogen and methane, among other gases, which implied the presence of hydrothermal activity in the liquid water ocean beneath Enceladus’s icy surface. Could these be analogous to hydrothermal vents like the “black smokers” on Earth, which are a haven for biology? Microbes living at these vents produce methane (and water) from hydrogen and carbon dioxide gas as part of their natural metabolic reactions.

The science team used a method known as Bayesian statistics, where probability is expressed as a degree of belief based on prior obtained data and insights. They took mathematical models of known geophysical, geochemical, and biological processes, and included them in their statistical approach to quantify the plausibility of different hypotheses about Enceladus.

Methane can be an indicator of biology, but it can also form through an abiotic reaction that most commonly occurs in Earth’s oceanic crust, called serpentinization, which produces methane when water reacts with certain rock types.

Affholder’s results showed that the methane concentrations measured in Enceladus’s gaseous plume are too high to be solely due to serpentinization. In fact, they concluded that the likeliest explanation is biology. Otherwise, to explain the high methane levels, an unknown abiotic process would have to be invoked.

This reminds me of the controversy over phosphine at Venus, which also was presented as being explainable only by biology or an unknown chemical process. While the detection of methane and hydrogen in the Enceladus plume is undebatable (contrary to the phosphine detection at Venus), this study is still inconclusive, since we aren’t certain whether life is even possible inside Enceladus.

The moon’s ice-covered ocean may well be habitable now (I actually expect that), but if life requires Darwin’s “little pond” on a solid planetary surface to arise in the first place, it would not have developed on Enceladus. In general, environmental constraints for the origin of life are likely much more restrictive then for its presence. In other words, there may be many uninhabited habitable places in the galaxy.

As long as we haven’t resolved this central question, I’m not certain whether statistical analyses like Affholder’s will really move us forward. But the question of life beneath the icy surface of Enceladus needs to be investigated. Any anomaly that we can’t readily explain needs to be looked at more closely. We might even have a stroke of luck. Let’s say the authors are correct about methanogenesis. If a follow-up mission to Saturn detects biology on Enceladus, it would tell us that hydrothermal vents are one place that life can originate.

A Possible Link between ‘Oumuamua and Unidentified Aerial Phenomena

Is there a connection between ‘Oumuamua and Unidentified Aerial Phenomena?

#space #oumuamua #UAP #UFO #extraterrestrial

If some UAP turn out to be extraterrestrial technology, they could be dropping sensors for a subsequent craft to tune into. What if ‘Oumuamua is such a craft?

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A Possible Link between 'Oumuamua and Unidentified Aerial Phenomena
Artist’s impression of the interstellar object ‘Oumuamua. Credit: Getty Images

A colleague of mine once noted that every morning there is a long line of customers stretching out from a famous Parisian bakery into the street. “I wish someone would wait for my scientific papers with as much anticipation as Parisians eagerly stand by for their baguettes,” he said.

There is one exception to this wish, however. It involves fresh scientific evidence that we are not be the only intelligent species in the cosmos.

Recently, there have been two sources for such evidence.

First, the interstellar object discovered in 2017, ‘Oumuamua, was inferred to have a flat shape and seemed to be pushed away from the sun as if it were a lightsail. This “pancake” was tumbling once every eight hours and originated from the rare state of the local standard of rest—which averages over the motions of all the stars in the vicinity of the sun.

Second, the Pentagon is about to deliver a report to Congress stating that some unidentified aerial phenomena (UAP) are real but that their nature is unknown. If UAP originated from China or Russia and were a national security risk, their existence would have never been revealed to the public. Hence, it is reasonable to conclude that the U.S. government believes that some of these objects are not human in origin. This leaves two possibilities: either UAP are natural terrestrial phenomena or they are extraterrestrial in origin. Both possibilities imply something new and interesting that we did not know before. The study of UAP should therefore shift from occupying the talking points of national security administrators and politicians to the arena of science where it is studied by scientists rather than government officials.

Many or even most UAP might be natural phenomena. But even if one of them is extraterrestrial, might there be any possible link to ‘Oumuamua?

The inferred abundance of ‘Oumuamua-like objects is unreasonably large if they’re of purely natural origin. With Amaya Moro-Martín and Ed Turner, I wrote a paper in 2009 calculating the number of interstellar rocks based on what is known about the solar system and assuming that these rocks were ejected from similar planetary systems orbiting other stars. The population of objects required to explain the discovery of ‘Oumuamua exceeds the expected number of interstellar rocks per unit volume by orders of magnitude. In fact, there should be a quadrillion ‘Oumuamua-like objects within the solar system at any given time, if they are distributed on random trajectories with equal probability of moving in all directions.

But the number is reasonable if ‘Oumuamua was an artificial object on a targeted mission towards the sun, aimed to collect data from the habitable region near Earth. One might even wonder whether ‘Oumuamua might have been retrieving data from probes that were already sprinkled on Earth at an earlier time. In such a case, ‘Oumuamua’s thin, flat shape could have been that of a receiver. Hence, ‘Oumuamua was pushed by sunlight not for the purpose of propulsion but as a byproduct of its thin flat shape. A similar push by reflection of sunlight without a cometary tail were the traits of an artificial rocket booster that was identified in 2020 by the same Pan-STARRS telescope that discovered ‘Oumuamua. This artificial object named 2020 SO was not designed to be a solar sail but had thin walls with a large surface-to-mass ratio for a different purpose.

At this time, the possibility that any UAP are extraterrestrial is highly speculative. But if we entertain this possibility for fun, then the tumbling motion of ‘Oumuamua could potentially have been meant to scan signals from all viewing directions. A predecessor to ‘Oumuamua could have been a craft that deposited small probes into the Earth’s atmosphere without being noticed, because it visited before Pan-STARRS started its operations. Along this imaginative line of reasoning, ‘Oumuamua could have arranged to appear as coming from the neutral local standard of rest, which serves as the local “galactic parking lot,” so that its origin would remain unknown.

But rather than simply wonder about possible scenarios, we should collect better scientific data and clarify the nature of UAP. This can be done by deploying state-of-the-art cameras on wide-field telescopes that monitor the sky. The sky is not classified; only government-owned sensors are. By searching for unusual phenomena in the same geographical locations from where the UAP reports came, scientists could clear up the mystery in a transparent analysis of open data.

As noted in my recent book Extraterrestrial, I do not enjoy science fiction stories because the story lines often violate the laws of physics. But we should be open-minded to the possibility that science will one day reveal a reality that was previously considered as fiction.

The largest comet ever discovered in modern times is zooming toward the sun

Strange Mega Comet Heading Towards our Solar System – UN271

  • “We have the privilege of having discovered perhaps the largest comet ever seen.”
  • It has not visited the solar system in more than 3 million years.
  • People here on Earth will likely need to rely on telescopes to capture photographs of it.

This is a big one.

A giant comet – which scientists say is arguably the largest comet discovered in modern times – is on its way toward the sun and will make its closest approach to Earth in 2031.

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“We have the privilege of having discovered perhaps the largest comet ever seen – or at least larger than any well-studied one – and caught it early enough for people to watch it evolve as it approaches and warms up,” said University of Pennsylvania astronomer Gary Bernstein, a co-discoverer of the object.

It is the most distant comet to be discovered on its incoming path, giving us years to watch it evolve as it approaches the sun, the National Science Foundation said. 

The comet is also an infrequent visitor to our neck of the woods: “It has not visited the solar system in more than 3 million years,” Bernstein said in a statement.

The comet, which is estimated to be 60 to 120 miles across, or about 10 times the diameter of most comets, is an icy relic flung out of the solar system by the migrating giant planets in the early history of the solar system.

This comet is quite unlike any other seen before, the National Science Foundation said, and the huge size estimate is based on how much sunlight it reflects. 

This illustration shows the distant Comet Bernardinelli-Bernstein as it might look in the outer solar system. Comet Bernardinelli-Bernstein is estimated to be about 1,000 times more massive than a typical comet, making it arguably the largest comet discovered in modern times.

At its current pace, the comet will travel from its current point just past Neptune’s orbit to nearly reach Saturn’s orbit in 2031, Smithsonian magazine said.

The object probably will only be about as bright as Pluto’s moon Charon at that point, according to New Atlas, so people here on Earth will likely need to rely on telescopes to capture photographs of it. Then it will head back into distant space from where it came.

The comet probably came from the Oort Cloud, which is believed to be a giant spherical shell that surrounds the solar system, according to NASA. Most long-period comets such as this one come from the Oort Cloud, NASA said.

It could be the largest object from the Oort Cloud ever detected, and it is the first comet on an incoming path to be detected so far away.Get the Coronavirus Watch newsletter in your inbox.

Astronomers suspect that there may be many more undiscovered comets of this size waiting in the Oort Cloud. These giant comets are thought to have been scattered to the far reaches of the solar system by the migration of Jupiter, Saturn, Uranus and Neptune early in their history.

The comet is dubbed Bernardinelli-Bernstein after the two astronomers who discovered it: Pedro Bernardinelli (also from the University of Pennsylvania) and Gary Bernstein. Its official name is 2014 UN271.

How will the universe end?

The Beginning to the End of the Universe: The Big Crunch vs. The Big Freeze

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#Space #Cosmology #universe #darkmatter #BigCrunch #BigFreeze #BigRip

Astronomers once thought the universe could collapse in a Big Crunch. Now most agree it will end with a Big Freeze.


If the expanding universe could not combat the collective inward pull of gravity, it would die in a Big Crunch, like the Big Bang played in reverse. However, the cosmos is ballooning up at an ever-increasing rate, which makes most astronomers think the universe will die in a Big Freeze, where any lingering particles are separated by distances greater than the current observable universe.

How will the universe end? Humanity has pondered this question for thousands of years. And now science actually has the knowledge and tools to attempt an answer.

Until rather recently, astronomers thought the cosmos would repeatedly expand and collapse in an infinite cycle of cosmic death and rebirth. But the best evidence points to a distant Armageddon filled with more existential dread than the Book of Revelation. Trillions of years in the future, long after Earth is destroyed, the universe will drift apart until galaxy and star formation ceases. Slowly, stars will fizzle out, turning night skies black. All lingering matter will be gobbled up by black holes until there’s nothing left. Finally, the last traces of heat will disappear.

Alpha and Omega

The universe didn’t always seem destined to end this way. Roughly a century ago, astronomers thought that our Milky Way Galaxy was the entire universe. Our cosmos appeared static — it had always been, and would always remain, roughly the same. However, as Albert Einstein formulated his theories of relativity, he noticed signs of something strange. His equations implied a universe in motion, either expanding or contracting. So Einstein added a fudge factor — a cosmological constant — that held the universe in a more appealing steady state.

“Einstein was not being stupid; he was feeling the feeling of astronomers,” says Nobel Prize-winning cosmologist John Mather, the head scientist for NASA’s James Webb Space Telescope.

However, around the same time, astronomers began to accept that some of the fuzzy spiral-shaped nebulae they observed through their telescopes were not collections of stars in our galaxy. They were other galaxies entirely. And when Edwin Hubble meticulously measured their motions, he showed these galaxies were indeed moving away from our own. Humanity had discovered that the universe is expanding.

Pressing rewind on that expansion ultimately revealed that the entire universe was born in a violent Big Bang some 13.8 billion years ago. With its foundations firmly fixed, cosmology turned to the next great question: How will the universe end?

There are two main ways for an expanding universe to die: The cosmos could eventually collapse back in on itself, or it could continue inflating forever. To find out which is right, astronomers had to fast-forward the evolution of the universe.


There are a few ways the universe might end, but exactly how depends on how the rate of cosmic expansion changes in the future. If gravity overpowers expansion, the cosmos will collapse in a Big Crunch. If the universe continues to expand indefinitely, as expected, we’ll face a Big Freeze. But if dark energy pushes the expansion rate to near infinity, we’ll have a Big Rip that tears everything, even atoms, apart.

The Big Crunch

In 1922, Russian physicist and mathematician Alexander Friedmann derived a famous set of equations aptly named the Friedmann equations. These calculations showed that our universe’s destiny is determined by its density, and it could either expand or contract, rather than remain in a steady state. With enough matter, gravity would eventually halt the cosmos’ expansion, causing it to come crashing back inward.

In the 1960s and 1970s, when astronomers added up all the matter in the known universe, they calculated there was enough mass that the cosmos should ultimately collapse to an infinitely dense state, or perhaps even a gargantuan black hole.

Some speculated that once compressed into an infinitely small point — the Big Crunch — the universe would kickstart yet another expansion, or Big Bounce.

In the 1970s and 1980s, physicist John Wheeler, who helped coin the term black hole, became a leading proponent of the Big Crunch. To him, it was an obvious fate. A revolution in understanding black holes was underway, and Wheeler saw each one as an “experimental model” of the universe’s final state.

But Wheeler’s Big Crunch fondness was partially born from aesthetics, he admitted. It was easy to picture.


NASA’s Spitzer and WISE infrared observatories paired up to reveal this view of the region around the Milky Way’s supermassive black hole, Sagittarius A*. Supermassive black holes are likely to be the last reservoirs of matter in the entire universe. Yet even they will eventually evaporate.NASA/JPL-Caltech/Judy Schmidt

The Big Freeze

Unfortunately, reality is not always so relatable.

“Just because we might find a cold, empty universe an unappealing future doesn’t mean that that’s not where things are headed,” Columbia University physicist Peter Woit writes on his blog, Not Even Wrong.

In the late 1990s, two separate groups of scientists were surveying the distant universe, studying dying stars called type Ia supernovae, which serve as standard candles that help establish cosmic distances. They found distant blasts appeared dimmer, and were therefore farther away, than expected. The universe’s expansion wasn’t slowing down at all — it was speeding up. The teams had independently stumbled onto dark energy, shattering existing models of the universe. (See “The mystery of dark energy,” page 53.)

The expectation-defying discovery of dark energy showed the universe was very unlikely to collapse in a Big Crunch. Even with all the matter in the universe tugging inward, gravity will never be strong enough to overcome the inflating effect of dark energy. In other words, the ballooning universe is destined for a Big Freeze.

These days, astronomers think normal matter comprises just 5 percent of the universe’s contents. Meanwhile, dark matter makes up some 26 percent, and dark energy accounts for the final 69 percent. Dark energy, it turns out, seems to be the real-world force behind Einstein’s cosmological constant, which plays a major role in preventing a Big Crunch-style collapse.

Thanks to the expansion caused by dark energy, within a couple of trillion years, all but the closest galaxies will be too far away to see. Then, perhaps 100 trillion years later, star formation will cease, as dense stellar remnants like white dwarfs and black holes lock up any remaining material.

About a googol years from now — that’s a 1 followed by 100 zeroes — the last objects in the universe, supermassive black holes, will finish evaporating via Hawking radiation. After this, the universe enters a so-called Dark Era, where matter is just a distant memory.

The second law of thermodynamics suggests that entropy will keep increasing in a system (such as the cosmos) until it hits a maximum level. In real terms, that means that at some point, the universe will ultimately reach a state where all energy — and, hence, heat — is uniformly distributed. The final temperature of the entire universe will hover a smidge above absolute zero.

So, rather than mirroring Revelation, the death of our cosmos will likely resemble the beginning of Genesis: All will be empty and dark.

Solar storm to hit earth, could shut down Internet; know online impact

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#Space #CME #solarstorm #internet #astronomy

A solar storm was sent shooting towards the Earth by the Sun. Can the Internet shut down? Know how severe the online impact can be.

A solar storm generated by the Sun, if it is really big, on the scale of the one that hit the Earth in 1859, then it has immense destructive power and can have a huge impact on online infra, including taking down the Internet.
A solar storm generated by the Sun, if it is really big, on the scale of the one that hit the Earth in 1859, then it has immense destructive power and can have a huge impact on online infra, including taking down the Internet. (Pixabay)

The Sun has hurled a solar storm into space and sent it careening on collision course towards the Earth. This poses multiple dangers here on the third rock from the Sun, especially to our digital world. How big an impact will it have on online infrastructure? Will our Internet be safe? Well, the Sun has an 11-year cycle during which it shoots out super-heated magnetised magma, referred to as ‘coronal mass ejections’ (CMEs) into space. The severity of the solar storm depends on which part of the cycle the Sun is in. Also, what is important is the location of the Earth in comparison to the trajectory of the solar flare. If an extremely severe solar storm is generated and the Earth is in its path, there will be a big impact on all communications devices including mobile phones, computers as well as electricity grids. However, if the Earth is not in the path of this severe solar storm, it escapes the destructive consequences.

Solar storm impact: If a really big solar storm was to hit the Earth, it would have an impact on our online activities – it could take down the Internet. How will solar storm affect online activities? Well, Science Focus explains the impact of a solar flare on Earth in an easy to understand manner, “If a CME on a similar scale was to strike the Earth today, it could damage the electronics in orbiting satellites, disrupting navigation and communications systems, as well as the GPS time synchronization that the internet relies on to function. It would also create a surge of electromagnetic radiation in the atmosphere, causing huge currents in our power grids which could burn out electrical transformers, leading to length(y) outages.” But remember, this is a worst-case scenario possibility.

The Mystery of Planet 9 – If It Exists, Why Can’t Researchers See It?

#Space #Astronomy #Planet9 #Solarsystem #Sedna

Does Planet Nine really exist?

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The jury is still out.

For the past few years, the possibility of a new (and big!) planet hanging around in the outermost regions of the solar system has tantalized scientists and the public alike. But after years of searching, astronomers have found zero new planets in that realm. 

Is “Planet Nine” really out there, or not?

The deep dark

We’ve only been studying the region of the solar system past the orbit of Neptune for a few decades now, and after a moment of introspection it’s easy to see why: astronomy out here is kind of challenging, because the objects we’re trying to hunt down are a) very, very small and b) very, very far away. That makes them hard to spot.

Besides Pluto, discovered by basically blind luck in 1930, our understanding of the outer solar system was completely absent until 1992, when astronomers found their first Kuiper Belt object, a frozen little remnant from the formation of the solar system, lazily circling the sun in near perfect darkness beyond Neptune.

Since then, we’ve found thousands more such objects, categorizing and subcategorizing them as we go (as astronomers are wont to do). For the rest of our story, we’ll be focusing on a class of characters known as extreme trans-neptunian objects, or eTNOs. If you’ve never heard that jargon term before, don’t be scared: it’s astronomese for “really, really far past the orbit of Neptune.”

In 2003, astronomers discovered perhaps the strangest eTNO yet, Sedna. Sedna is big, about half the size of Pluto, but sits in a truly ridiculous orbit. Over the course of 11,000 years (twice that of all of recorded human history), Sedna swings from 76 astronomical units (AU; one AU is the distance between the sun and Earth) to over 900 AU, then back again.

Sedna is weird.

The case for nine

The orbit of Sedna is so weird that it demands explanation. How can such a massive almost-planet reach such a huge, detached orbit without getting completely ejected from the solar system altogether?

Perhaps there’s something else out there, keeping Sedna on a leash.

More recently, a couple teams of astronomers began to notice some other funky eTNOs. Namely, a group of half a dozen objects with similar orbits — they had roughly the same amount of ellipticity, and those ellipses were clustered together.

Imagine picking up a random flower from a field and looking at the petals. You’d normally expect the petals to be distributed evenly around the flower, but if you saw them all clustered together you might think something suspicious was going on.

And the same goes for these strange eTNOs: there was no reason to expect these kinds of orbits by random chance. The best explanation, the astronomers claimed, was that a new planet, Planet Nine (until we come up with a better name), was shaping and shepherding them in their orbits.

But still eight remain

Click here for more videos…Join the search for Planet 9 – Here’s how!Look for the elusive Planet 9, brown dwarfs and more with NASA’s citizen scientist program Backyard Worlds.

It’s not a bad argument. The inability to explain the orbit of Uranus led to the detection of Neptune, so there is some historical antecedent to the strategy. And since then, more eTNOs have been found in the same strange, clustered orbits.Advertisement

But in the years since the claim of a ninth planet made headlines, astronomers haven’t snagged a picture of it. Which isn’t too worrisome, at least not yet: if Planet Nine exists, it is very small (relatively) and very far away, making it hard to spot.

And in that same time, other astronomers have weighed in, arguing that the special eTNOs aren’t so special after all. It could be that because of the way our surveys are designed and conducted, we’re simply more likely to spot eTNOs with these funky orbits, and not any of their friends with more normal orbits. In other words, these eTNOs aren’t shepherded by some mysterious entity in the outer solar system. There’s simply nothing to explain — they only look different because we haven’t finished looking yet.

What’s more, it’s hard to square the existence of a ninth planet with the formation of the solar system as we currently understand it. Astronomers can, of course, work to fold in a ninth planet (say, by arguing that it’s an ejected failed core of a planet or a captured rogue exoplanet), but the more complicated the scenario gets, the harder it is to swallow.

Without a smoking-gun picture of the planet, the astronomical community isn’t going to be fully swayed by the wayward motion of a handful of iceballs in the outer solar system. So for now the search for a new planet continues.

Why We Haven’t Met Any Aliens Yet!

#Space #Extraterrestrial #Aliens #Drakeequasion #UFO #exoplanets

Extraterrestrial life refers to life forms that did not originate and are not indigenous to our planet. So this term covers all possible types of life outside the Earth: These can be viruses, but also plant-like life forms. Some go even further: they are looking for creatures that are very similar to humans in their complexity or even surpass them, popularly known as aliens. But if there is extraterrestrial life, why hasn’t anyone heard about it until now? Do so-called aliens even exist? The Fermi Paradox addresses this very question. What approaches there are to this you can find out here!

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Why haven’t we found aliens yet?

A new paper on the Fermi paradox convincingly shows why we will probably never find aliens.

One summer night, when I was a child, my mother and I were scouring the night sky for stars, meteors, and planets.

Suddenly, an object with a light that pulsed steadily from bright to dim caught my eye. It didn’t have the usual red blinkers of an aircraft and was going far too slowly to be a shooting star.

Obviously, it was aliens.

My excitement was short-lived as my mother explained it was a satellite catching the sun as it tumbled along its orbit. I went to bed disappointed: The X-files was on TV twice a week back then, and I very much wanted to believe.

Today that hope is still alive and well, in Hollywood films, the public imagination, and even among scientists. Scientists first began searching for alien signals shortly after the advent of radio technology around the turn of the 20th century, and teams of astronomers across the globe have been taking part in the formal Search for Extraterrestrial Intelligence (SETI) since the 1980s.

Yet the universe continues to appear devoid of life.

Now, a team of researchers at the University of Oxford brings a new perspective to this conundrum. In early June, Anders Sandberg, Eric Drexler, and Toby Ord of the Future of Humanity Institute (FHI) released a paper that may solve the Fermi paradox — the discrepancy between our expected existence of alien signals and the universe’s apparent lack of them — once and for all.

Using fresh statistical methods, the paper re-asks the question “Are we alone?” and draws some groundbreaking conclusions: We Earthlings are not only likely to be the sole intelligence in the Milky Way, but there is about a 50 percent chance we are alone in the entire observable universe.

While the findings are helpful for thinking about the likelihood of aliens, they may be even more important for reframing our approach to the risk of extinction that life on Earth may face in the near future.

Where is everybody?

In 1950, while working at Los Alamos National Laboratory, physicist Enrico Fermi famously exclaimed to his colleagues over lunch: “Where is everybody?”

He had been pondering the surprising lack of evidence of other life outside of our planet. In a universe that had been around for some 14 billion years, and in that time developed more than a billion trillion stars, Fermi reasoned there simply must be other intelligent civilizations out there. So where are they?

We still don’t know, and the Fermi paradox has only strengthened with time. Since the 1950s, humans have walked on the moon, sent a probe beyond our solar system, and even sent an electric sports car into orbit around the sun for fun. If we can go from rudimentary wooden tools to these feats of engineering in under a million years, surely there would have been ample opportunity in our 13.8 billion-year-old universe for other civilizations to have progressed to a similar level — and far beyond — already?

And then, surely there would be some lingering radio signals or visual clues of their expansion reaching our telescopes.

How scientists try to tackle the Fermi paradox, and why this paper is different

Space is a large place, and the task of accurately estimating the likelihood of little green men isn’t exactly easy.

In 1961, astronomer Frank Drake proposed a formula that multiplied seven “parameters” together to estimate N, the number of detectable civilizations we should expect within our galaxy at a given moment in time:

The Drake equation was only intended as a rough tool to stimulate scientific discussion around the probability of extraterrestrial life. However, in the absence of any reasonable alternatives, it has remained astronomers’ only method of calculating the probability of extraterrestrial intelligence. This is problematic because while some parameters, such as R* — the rate of new star formation per year — are relatively well-known, others remain hugely uncertain.

Take L, the average lifespan of a detectable civilization. If we look at the average length of the past civilizations here on Earth, it wouldn’t be unreasonable to assume a low value. If the Romans, Incas, or Egyptians are anything to go by, it seems hard to make it past a few hundred years. On the flip-side, you could argue that once a civilization becomes technologically advanced enough to achieve interstellar travel, it could conceivably last many billions of years.

This enormous uncertainty leaves the Drake equation ultimately vulnerable to the optimism or pessimism of whoever wields it. And this is reflected in previous scientific papers whose results give values of N ranging anywhere from 10 to many billions.

As astronomer and SETI co-founder Jill Tarter eloquently put it in an interview with National Geographic in 2000: “The Drake Equation is a wonderful way to organize our ignorance.”

Sincere attempts to overcome this vulnerability have previously been made via selecting a handful of conservative, medium, and bullish best estimates for each parameter value and then taking an average across them.

In their new paper, titled “Dissolving the Fermi Paradox,” the FHI researchers dispute this method by demonstrating how this technique typically produces a value of N far higher than it should, creating the illusion of a paradox.

This is because simply selecting a few point estimates and plugging them into the Drake Equation misrepresents the state of our knowledge. As an example, imagine three scientists who have differing opinions on the value of L:

If you take a normal, linear average of all the possible integer values from one to 1000, you would implicitly factor scientist C’s opinion 90 times more than scientist A’s because their range of belief is 90 times larger. If you use a logarithmic scale to represent the above so that each scientist’s range corresponds to one order of magnitude, all three opinions will be represented more equally.

Therefore, the researchers represented the full range of possible values on a logarithmic scale and ran millions of simulations to obtain more statistically reliable estimates for N. They then applied a technique known as a Bayesian update to those results. That means mathematically incorporating the information that we have not discovered extraterrestrial intelligence yet (because the absence of evidence of aliens is evidence itself!).

This two-stage process produced striking results: Based upon the current state of astrobiological knowledge, there’s a 53 to 99.6 percent chance we are the only civilization in this galaxy and a 39 to 85 percent chance we are the only one in the observable universe.

This implies that life as we know it is incomprehensibly rare, and if other intelligences exist, they are probably far beyond the cosmological horizon and therefore forever invisible to us.

But life can’t be that rare, can it?

To be clear, the paper’s authors do not appear to be making any definitive claim about whether or not aliens exist; simply, our current knowledge across the seven parameters suggests a high likelihood of us being alone. As new information becomes available, they would update that likelihood accordingly. For example, if we discover a second instance of abiogenesis — the process of rudimentary life emerging from non-living matter — on a comet or another planet, then this would narrow the uncertainty on the fl parameter significantly.

Nonetheless, their results have certainly caused a stir, especially after SpaceX CEO Elon Musk tweeted them:

Many reacted to the paper’s findings by calling it anthropocentric and narrow-minded, arguing that any conclusion suggesting we Earthlings are somehow special is simply human arrogance.

This is somewhat understandable because the idea that intelligent life is extremely rare in the universe feels completely counterintuitive. We exist, along with other intelligent life like dolphins and octopi, so we assume what we see must be extrapolatable beyond Earth.

But this alone is not proof that intelligent civilizations are therefore ubiquitous. Whether the true likelihood is as high as one in two, or as inconceivable as one in a trillion trillion trillion, the mere ability to consciously ask ourselves that question depends on the fact that life has already successfully originated.

This phenomenon is known as an observer selection effect — a bias that can occur when thinking about the likelihood of an event because an observer has to be there to observe the event in the first place. As we only have one data point (us), we have no reliable way to predict the true likelihood of intelligent life. The only conclusion we can confidently draw is that it can exist.

So if we are alone, is this good or bad news?

Regardless of which side you take, the idea that we might be alone in the universe raises serious scientific and philosophical questions. Is our rareness something to celebrate or be disappointed by? What would it mean for humans to be the only conscious entities in the universe?

This last question matters hugely. Not only are we depleting our environmental resources at an unsustainable pace, but for the first time in the history of mankind, we’ve reached the technological stage where we hold the entire future of our species in our own hands. Within a few years we built enough nuclear weapons to exterminate every human on earth many times over and made these weapons available to our leaders on a hair-trigger. Each decade has brought us novel technologies with ever-increasing potential for both immense good and immense destruction.

As we rang in the new year, the Bulletin of Atomic Scientists moved the Doomsday Clock to the closest it has ever been to midnight. Meanwhile, estimates from various specialists in existential risk suggest somewhere between a 5 to 19 percent chance of complete human extinction by the end of this century — an unacceptably large probability considering the stakes.

Not only does this dark gamble affect the 7 billion of us alive today; if you factor in the moral weight of the billion billions of future people who would also never get to live out their existences, it becomes clear that we urgently need to get our collective act together.

As Carl Sagan famously said in his 1990 Pale Blue Dot speech: In all this vastness, there is no hint that help will come from elsewhere to save us from ourselves. The Earth is the only world known so far to harbor life. … the Earth is where we make our stand.”

He’s not wrong, especially in light of this paper’s findings. If humanity really is the only civilization that may ever exist in this universe, then we shoulder a responsibility on a truly astronomical scale.

Ride Along With Juno Past Ganymede And Jupiter

#space #Juno #Ganymede #Jupiter #NASA

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Ride along with Juno

The Juno spacecraft made its most recent flyby of the giant planet Jupiter on June 8, 2021. Shortly before its closest point to Jupiter – the 34th of the mission, or perijove 34 – Juno flew closer to Jupiter’s large moon Ganymede than any spacecraft has in more than two decades. On July 14, NASA released the beautiful video above. It lets you ride along with the Juno spacecraft on this most recent sweep past Ganymede and Jupiter. The video is gorgeous and evocative. Juno’s principal investigator Scott Bolton of the Southwest Research Institute in San Antonio said in a statement:

The animation shows just how beautiful deep space exploration can be. It’s a way for people to imagine exploring our solar system firsthand by seeing what it would be like to be orbiting Jupiter and flying past one of its icy moons.

The images to make this time-lapse animation came from JunoCam, the visible-light camera/telescope aboard the Juno spacecraft. NASA 

The 3:30-minute-long animation begins with Juno approaching Ganymede. It passed within 645 miles (1,038 km) of Ganymede’s surface at a relative velocity of 41,600 mph (67,000 kph). The imagery shows several of the moon’s dark and light regions. Darker regions are believed to result from ice sublimating into the surrounding vacuum, leaving behind darkened residue. The imagery also shows the crater Tros, which is among the largest and brightest crater scars on Ganymede.

It takes just 14 hours, 50 minutes for Juno to travel the 735,000 miles (1.18 million km) between Ganymede and Jupiter. The viewer is transported to within just 2,100 miles (3,400 km) above Jupiter’s spectacular cloud tops. By that point, Jupiter’s powerful gravity has accelerated the spacecraft to almost 130,000 mph (210,000 kph) relative to the planet.

Among the Jovian atmospheric features that can be seen are the circumpolar cyclones at the north pole and five of the gas giant’s string of pearls. These are eight massive storms rotating counterclockwise in Jupiter’s southern hemisphere. They appear as white ovals.

Using information that Juno has learned from studying Jupiter’s atmosphere, the animation team simulated lightning one might see as we pass over Jupiter’s giant thunderstorms.

Planet Jupiter seen close up, with a string of 5 white ovals visible on its surface amid parallel swirly bands.
View larger. | JunCam image of Jupiter during the June 8, 2021, flyby (perijove 34). We see the white ovals known as Jupiter’s “string of pearls.” They are massive counterclockwise-rotating storms in the atmosphere of the giant planet’s southern hemisphere. Since 1986, they’ve varied in number from 6 to 9. There are currently 8 white ovals on Jupiter, of which 5 are seen here. Image via SWRI.

How they made the video

Citizen scientist Gerald Eichstädt used composite images of Ganymede and Jupiter to give us the camera’s point of view. For both Ganymede and Jupiter, NASA said:

JunoCam images were orthographically projected onto a digital sphere and used to create the flyby animation. Synthetic frames were added to provide views of approach and departure for both Ganymede and Jupiter.

Juno mission extended to 2025

NASA said that, as planned, Jupiter’s gravitational pull has now affected Juno’s orbit. The craft has been in a highly elliptical polar orbit of 53 days since 2016. In other words, it has been passing close to the giant planet only that often. Now Jupiter’s strong gravity has reduced Juno’s orbit to 43 days.

The Juno mission was originally scheduled to end in July 2021. But in January of this year, NASA extended the mission. Juno will now continue exploring Jupiter through September 2025, or until the spacecraft’s end of life. NASA said on January 13, 2021:

This expansion tasks Juno with becoming an explorer of the full Jovian system – Jupiter and its rings and moons – with multiple rendezvous planned for three of Jupiter’s most intriguing Galilean moons: Ganymede, Europa, and Io.

The next Juno flyby of Jupiter, the 35th of the mission, is scheduled for a few days from now, July 21, 2021.

Ride along with Juno: Animation showing the looping orbit of Juno around Jupiter.
The purple loops represent the Juno spacecraft’s orbit. Jupiter is the green dot. Juno follows a highly elliptical, polar orbit around Jupiter, designed to minimize its exposure to Jupiter’s radiation belts. Each orbit is slightly adjusted so the craft will fly over a different face of Jupiter when closest. Thus Juno has studied Jupiter’s entire surface over its 37 planned orbits between 2016 and July 2021. Image via Phoenix7777/ Wikimedia Commons.

Bottom line: A beautiful video showing the most recent flyby of the Juno spacecraft at Jupiter. In the course of this flyby, Juno came closer to Jupiter’s large moon Ganymede than any spacecraft has in two decades.

REAL Possibilities for Interstellar Travel

#Space #interstellar #Wormhole #Ion #Rocket

These New Technologies Could Make Interstellar Travel Real

Long considered science fiction, leaving the solar system and speeding amid the stars may soon be within reach

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Beyond Solar System - NASA

(Credit: Charles Carter/Keck Institute for Space Studies via NASA)

On October 31, 1936, six young tinkerers nicknamed the “Rocket Boys” nearly incinerated themselves in an effort to break free of Earth’s gravity. The group had huddled in a gully in the foothills of California’s San Gabriel Mountains to test a small alcohol-fueled jet engine. They wanted to prove that rocket engines could venture into space, at a time when such ideas were widely met with ridicule. That goal was disrupted when an oxygen line caught fire and thrashed around wildly, shooting flames.

The Rocket Boys’ audacity caught the attention of aerodynamicist Theodore von Karman, who already worked with two of them at Caltech. Not far from the location of their fiery mishap, he established a small test area where the Rocket Boys resumed their experiments. In 1943, the site became the Jet Propulsion Laboratory (JPL), and von Karman its first director. JPL has since grown into a sprawling NASA field center with thousands of employees, yet it has managed to retain its founding motivation: test the limits of exploration, convention be damned.

They’ve had many successes over the years. In the early 1970s, JPL engineers built Pioneer 10, the first spacecraft to reach escape velocity from the solar system. A few years later, they followed up with Voyagers 1 and 2, the fastest of the many objects aimed at interstellar space. From the beginning of the Space Age to the launch of the Voyager spacecrafts — a span of just two decades — rocket scientists more than doubled flight speeds. But in the decades since, only one more spacecraft has followed the Voyagers out of the solar system, and nothing has done so at such a high speed. Now JPL’s rocketeers are getting restless again, and quietly plotting the next great leap.

The consistent theme of the new efforts is that the solar system is not enough. It is time to venture beyond the known planets, on toward the stars. John Brophy, a flight engineer at JPL, is developing a novel engine that could accelerate space travel by another factor of 10. Leon Alkalai, a JPL mission architect, is plotting a distant journey that would begin with an improbable, Icarus-esque plunge toward the sun. And JPL research scientist Slava Turyshev has perhaps the wildest idea of all, a space telescope that could provide an intimate look at a far-off Earth-like planet — without actually going there.

These are all long shots (not entirely crazy, according to Brophy), but if even one succeeds, the implications will be huge. The Rocket Boys and their ilk helped launch humans as a space-faring species. The current generation at JPL could be the ones to take us interstellar.

Dawn Spacecraft - NASA

NASA’s Dawn spacecraft used ion propulsion to explore Ceres. Future missions could take the tech even further. (Credit: NASA-JPL/Caltech)

Rocket Reactions

For Brophy, inspiration came from Breakthrough Starshot, an extravagantly bold project announced in 2016 by the late Stephen Hawking and Russian billionaire Yuri Milner. The ultimate aim of the project is to build a mile-wide laser array that could blast a miniature spacecraft to 20 percent the speed of light, allowing it to reach the Alpha Centauri star system (our closest stellar neighbor) in just two decades.

Brophy was skeptical but intrigued. Ambitious aspirations are nothing new for him. “JPL encourages people to think outside the box, and my wacky ideas are getting wackier in time,” he says. Even by that standard, the Starshot concept struck him as a little too far from technological reality. But he did begin to wonder if he could take the same concept but scale it down so that it might actually be feasible within our lifetimes.

What especially captivated Brophy was the idea of using a Starshot-style laser beam to help deal with the “rocket equation,” which links the motion of a spacecraft to the amount of propellant it carries. The rocket equation confronts every would-be space explorer with its cruel logic. If you want to go faster, you need more fuel, but more fuel adds mass. More mass means you need even more fuel to haul around that extra weight. That fuel makes the whole thing heavier still, and so on. That’s why it took a 1.4 million-pound rocket to launch the 1,800-pound Voyager probes: The starting weight was almost entirely fuel.

Since his graduate student days in the late 1970s, Brophy has been developing a vastly more efficient type of rocketry known as ion propulsion. An ion engine uses electric power to shoot positively charged atoms (called ions) out of a thruster at high velocity. Each atom provides just a tiny kick, but collectively they can push the rocket to a much greater velocity than a conventional chemical rocket. Better yet, the power needed to run the ion engine can come from solar panels — no heavy onboard fuel tanks or generators required. By squeezing more speed out of less propellant, ion propulsion goes a long way toward taming the rocket equation.

But ion engines come with drawbacks of their own. The farther they get from the sun, the more limited they are by how much electricity their solar panels can generate. You can make the panels huge, but then you add a lot of weight, and the rocket equation slams you again. And ion engines have such gentle thrust that they can’t leave the ground on their own; it then takes them a long time in space to accelerate to their record-breaking speeds. Brophy knows these issues well: He helped design the ion engine aboard NASA’s Dawn spacecraft, which just completed an 11-year mission to asteroid Vesta and dwarf planet Ceres. Even with its formidable 65-foot span of solar cells, Dawn went from zero to 60 in an unhurried four days.

Space Laser for Interstellar Travel - Smith/Discover

An orbiting laser system could power an ion propulsion vehicle through the solar system, and prove reusable. (Credit: Jay Smith/Discover)

Ion the Prize 

While Brophy was pondering this impasse between efficient engines and insufficient solar power, the Breakthrough Starshot concept came out, and it got the gears turning in his head. He wondered: What if you replaced sunshine with a high-intensity laser beam pointed at your spacecraft? Powered by the more efficient laser, your ion engine could run much harder while still saving weight by not having to carry your power source on board.about:blankabout:blank

Two years after his epiphany, Brophy is giving me a tour of an SUV-size test chamber at JPL, where he puts a high-performance ion engine through its paces. His prototype uses lithium ions, which are much lighter than the xenon ions Dawn used, and therefore need less energy to attain higher velocities. It also runs at 6,000 volts compared with Dawn’s 1,000 volts. “The performance of this thing would be very startling if you had the laser to power it up,” he says.

There’s just one minor issue: That laser does not exist. Although he drastically downsized the Starshot concept, Brophy still envisions a 100-megawatt space-based laser system, generating 1,000 times more power than the International Space Station, aimed precisely at a fast-receding spacecraft. “We’re not sure how to do that,” he concedes. It would be by far the biggest off-world engineering project ever undertaken. Once built, though, the array could be used over and over, with different missions, as an all-purpose rocket booster.

As an example, Brophy describes a lithium-ion-powered spacecraft with 300-foot wings of photovoltaic panels powering a full-size version of the engine he is developing at JPL. The laser would bathe the panels in light a hundred times as bright as sunshine, keeping the ion engine running from here to Pluto, about 4 billion miles away. The spacecraft could then coast along on its considerable velocity, racking up another 4 billion miles every year or two.

At that pace, a spacecraft could rapidly explore the dim areas where comets come from, or set off for the as-yet-undiscovered Planet 9, or go … almost anywhere in the general vicinity of the solar system.

“It’s like we have this shiny new hammer, so I go around looking for new nails to pound in,” Brophy says dreamily. “We have a whole long list of missions that you could do if you could go fast.”

Interstellar Medium Diagram - NASA

Only the Voyager probes have passed the heliopause, leaving the sun’s influence. New probes may one day study the interstellar medium lying beyond. (Credit: NASA-JPL/Caltech)about:blankabout:blank

Interstellar Medium Well 

After Brophy’s genial giddiness, it is a shock to talk to Alkalai, in charge of formulating new missions at JPL’s Engineering and Science Directorate. Sitting in his large, glassy office, he seems every bit the no-nonsense administrator, but he, too, is a man with an exploratory vision.

Like Brophy, Alkalai thinks the Breakthrough Starshot people have the right vision, but not enough patience. “We’re nowhere near where we need to be technologically to design a mission to another star,” he says. “So we need to start by taking baby steps.”

Alkalai has a specific step in mind. Although we can’t yet visit another star, we can send a probe to sample the interstellar medium, the sparse gas and dust that flows between the stars.

“I’m very interested in understanding the material outside the solar system. Ultimately, we got created from that. Life originated from those primordial dust clouds,” Alkalai says. “We know that there’s organic materials in it, but what kind? What abundances? Are there water molecules in it? That would be huge to understand.”about:blankabout:blank

The interstellar medium remains poorly understood because we can’t get our hands on it: A constant blast of particles from the sun — the solar wind — pushes it far from Earth. But if we could reach beyond the sun’s influence, to a distance of 20 billion miles (about 200 times Earth’s distance from the sun), we could finally examine, for the first time, pristine samples of our home galaxy.

Alkalai wants answers, and he wants to see the results firsthand. He’s 60, so that sets an aggressive schedule — no time to wait for giant space lasers. Instead, he proposes a simpler, albeit still unproven, technology known as a solar thermal rocket. It would carry a large cache of cold liquid hydrogen, protected somehow from the heat of the sun, and execute a shocking dive to within about 1 million miles of the solar surface. At closest approach, the rocket would let the intense solar heat come pouring in, perhaps by jettisoning a shield. The sun’s energy would rapidly vaporize the hydrogen, sending it racing out of a rocket nozzle. The combined push from the escaping hydrogen, and the assist from the sun’s own gravity, would let the ship start its interstellar journey at speeds up to 60 miles per second, faster than any human object yet —and it only gets faster from there.

“It’s very challenging, but we’re modeling the physics now,” Alkalai says. He hopes to begin testing elements of a thermal-rocket system this year, and then develop his concept into a realistic mission that could launch in the next decade or so. It would reach the interstellar medium another decade after that. In addition to sampling our galactic environment, such a probe could examine how the sun interacts with the interstellar medium, study the structure of dust in the solar system and perhaps visit a distant dwarf planet along the way.

It would be a journey, Alkalai says, “like nothing we’ve done in the past.”

Solar Gravitational Lens - Various, Jay Smith/Discover

How a solar gravitational lens works. (Credits: Courtesy of Slava Turyshev; The Aerospace Corp.; Jim Deluca/Jimiticus via YouYube (2); Jay Smith)

Catch A Glimpse

Solar thermal rockets and laser-ion engines, impressive as they may be, are still absurdly inadequate for crossing the tremendous gulf between our solar system and exoplanets — planets orbiting other stars. In the spirit of the Rocket Boys, Turyshev is not letting absurdity stop him. He is developing a cunning workaround: a virtual mission to another star.

Turyshev tells me he wants to send a space telescope to a region known as the solar gravitational lens (SGL). The area begins a daunting 50 billion miles away, though that’s still hundreds of times closer than our closest stellar neighbors. Once you get far enough into the SGL, something marvelous happens. When you look back toward the sun, any object directly behind it appears stretched out, forming a ring, and hugely magnified. That ring is the result of our star’s intense gravity, which warps space like a lens, altering the appearance of the distant object’s light.

If you position yourself correctly within the SGL, the object being magnified from behind the sun could be an intriguing exoplanet. A space telescope floating at the SGL, Turyshev explains, could then maneuver around, sampling different parts of the light ring and reconstructing the snippets of bent light into megapixel snapshots of the planet in question.

I have to interrupt him here. Did he say megapixel, like the resolution you get on your camera phone? Yes, he really is talking about an image measuring 1,000 by 1,000 pixels, good enough to see details smaller than 10 miles wide on a planet up to 100 light-years (600 trillion miles!) away.

“We could peek under the clouds and see continents. We could see weather patterns and topography, which is very exciting,” Turyshev says. He doesn’t mention it, but he doesn’t need to: That kind of resolution could also reveal megacities or other giant artificial structures, should they exist.

Assuming the JPL boffins can solve the transportation issues of getting to the SGL, the mission itself is fairly straightforward, if enormously challenging. Turyshev and his collaborators (Alkalai among them) will need to develop a Hubble-size space telescope,

or a mini-fleet of smaller telescopes, that can survive the 30-year journey. They will need to perfect an onboard artificial intelligence capable of running operations without guidance from home. Above all, they will need a target — a planet so intriguing that people are willing to spend decades and billions of dollars studying it. NASA’s TESS space telescope is doing some of that reconnaissance work right now, scanning for Earth-size worlds around local stars.

“Ultimately, to see the life on an exoplanet, we will have to visit. But a gravity lens mission allows you to study potential targets many decades, if not centuries, earlier,” Turyshev says merrily.

A journey to the SGL would take us beyond Alkalai’s baby steps, well onto the path toward interstellar exploration. It’s another audacious goal, but at least the odds of catching fire are much lower this time around.

NASA’s Mars rover snaps shots of unique rock formation in ‘ancient lakebed’

#Mars #Rover #Astronomy #Space #NASA

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NASA’s Mars rover Perseverance has sent pictures back to Earth of a unique rock formation within what the space agency called an “ancient lakebed” in its latest reported discovery during it mission on the Red Planet.

“Check out this patch of rock I found: looks kind of like garden pavers, and is probably exposed bedrock,” read a message from the research robot’s Twitter account on Wednesday. “Material like this, from the early days of this ancient lakebed, can help capture what that lake was like. Spending a few days investigating…”

Perseverance arrived on Mars on Feb. 18 after a six-month journey through space. The rover’s landing site was at the Jezero Crater, and “scientists believe the area was once flooded with water and was home to an ancient river delta,” according to NASA.

Check out this patch of rock I found: looks kind of like garden pavers, and is probably exposed bedrock. Material like this, from the early days of this ancient lakebed, can help capture what that lake was like. Spending a few days investigating…— NASA’s Perseverance Mars Rover (@NASAPersevere) July 14, 2021

The rover is being assisted by Integrity, NASA’s Mars helicopter, which made its ninth flight on Mars earlier this month. Integrity made history on April 19 by completing the first controlled flight by an aircraft on a planet other than Earth.

“My science team is poring over these color images from the #MarsHelicopter’s latest flight,” Perseverance’s Twitter account posted last week along with video of Martian terrain. “Ingenuity crossed over a region that would be tricky for me to drive on, adding a new perspective to the picture of Jezero Crater that I’m piecing together.”

My science team is poring over these color images from the #MarsHelicopter’s latest flight. Ingenuity crossed over a region that would be tricky for me to drive on, adding a new perspective to the picture of Jezero Crater that I’m piecing together.

More:— NASA’s Perseverance Mars Rover (@NASAPersevere) July 9, 2021

Perseverance marked NASA’s ninth landing on Mars and is the agency’s fifth rover. She is also the largest, weighing in at more than a metric ton.

Calling all aliens: What’s the best way to contact our galactic neighbors?

#Alien #Communication #ET #UAP #Civilization #Extraterrestrial

Making contact with probes would be better than trying to start a conversation across 100 light years of space

Making contact with probes would be better than trying to start a conversation across 100 light years of spacediverspixel/DepositphotosVIEW 34 IMAGES

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August 20, 2017 marks the 40th anniversary of the launch of the the first NASA Voyager mission, which is carrying a golden record filled with messages to potential civilizations beyond our solar system. This year is also the 20th anniversary of the sci-fi film Contact that dealt with receiving radio messages from extraterrestrials. Both the record and the film were brain children of the late Carl Sagan and raise an interesting question: which approach has the greater chance of success of making contact with aliens – sending radio messages or unmanned probes?

First contact with extraterrestrial civilizations has long fascinated scientists, philosophers, and writers. It’s been the topic explored by serious scientific studies, crackpots, tabloids, science fiction epics, and international debates. The speculated results of the first meeting of man and alien run the entire gamut of imagination. Visits by aliens or receiving greetings from the stars has been seen as ranging from wonderfully transcendent, with the human race raised to the next step in evolutionary perfection, to us ending up as the main course on someone’s dinner table.

Whether the outcome is the end of 2001: a Space Odyssey or To Serve Man, how will we establish contact with whoever or whatever lives beyond our solar system? Will our first contact be an alien spaceship carrying little green men? A probe operated by an artificial intelligence? A mysterious artifact buried on the Moon? A radio signal blaring out from the stars? Zaphod Beeblebrox crashing a party in Islington?

The Allen Telescope Array
The Allen Telescope Array

The problem with answering this question is that we know literally nothing about any other intelligent life forms. We don’t even know if they exist or even how probable their existence is. As to how they think, their limitations, or what manner they might choose to make themselves known to us, these are questions that are so complex that it often wanders into the realm of metaphysics, if not theology.

A much easier way of reaching an answer is to ask not “How will they contact us?” but “How will we contact them?” If we can answer the latter, then we are a great deal closer to answering the former. Knowing how to send messages tells you how to receive them.

First attempts

The idea of trying to contact ET is the reverse of the conventional practice of the Search for ExtraTerrestrial Intelligence (SETI). Founded in 1984, SETI is a passive search for signs of other civilizations, usually in the form of radio signals showing definite signs of intelligence, though other evidence might be sought. Deliberate contact attempts are called Active SETI or METI (Messaging to ExtraTerrestrial Intelligence), a term coined by the Russian scientist Alexander Zaitsev to denote an aggressive program of composing and sending messages to the stars.

But this idea isn’t particularly new. In fact, proposals for contacting other planetary bodies go back as far as around 1820 when the Joseph Johann von Littrow, director of the Vienna Observatory, suggested creating circles, squares and triangles 30 km on a side in the Sahara Desert by digging ditches one kilometer-wide and filling them with water topped with kerosene. This would be set alight at night in the hopes of contacting anyone on the Moon or Mars.

In 1868, inventor Charles Cros put forward a plan to the French Academy of Sciences to set up giant parabolic mirrors reflecting arc lamps with a focal length equal to the distance between Earth and Mars. Cros’ plan was to concentrate the sun’s rays on the Martian desert to carve geometric figures and numbers in molten glass on the surface. In another proposal, he suggested building an enormous checkerboard with shiny surfaces that could be uncovered to form shapes and patterns like a mechanical digital display that the Martians could view using telescopes.

In the 1890s, the Reverend W S Lach-Szyrma suggested lighting up the Riga, the Malvern Hills, or Lake Michigan with geometric patterns. Meanwhile, German mathematician Karl Friedrich Gauss recommended creating a giant right-angle triangle in Siberia using 15 km-wide strips of forest with fields of wheat as the background to form the famous geometric solution to the Pythagorean theorem. The whole thing would have been about the size of Ireland.

Not to be outdone, electrical pioneer Nikola Tesla in 1896 claimed that a more advanced version of his device for transmitting electrical power without wires could be used to contact Mars, and in 1899 he said that he’d detected signals from the Red Planet.

Hugo Gernsback's idea for contacting the planets
Hugo Gernsback’s idea for contacting the planets

But perhaps the prize for the most ambitious early scheme should go to the popular science publisher and science fiction pioneer Hugo Gernsback, who in the February 1927 edition of his Radio News magazine put forward the idea of building a directional radio transmitter belting out 100,000 kilowatts in the two-meter band. True, it would have to have been a heavy bar of silver or copper glowing white hot to take all that power, but Gernsback claimed that it could not only communicate with Venus or Mars, but could also bounce radio signals off the Moon and back to Earth.

Is there anybody there?

But if we’re going to talk to other civilizations, where do we start? We start with answering a few basic questions, like is there anyone to talk to? For our purposes, we don’t need to go into all the complexities of astrobiology, planet formation or how to define the habitable zone. What we need is a rough idea of the probability of the present existence of intelligent life, how far away they are, and how advanced they are. This will tell us not only where to direct our efforts, but also when we can expect a reply, and whether they’ll understand us.

These are questions that go back to the late 1950s when the SETI field was first pioneered by Cornell scientists Giuseppe Cocconi, Philip Morrison and Frank Drake at the Green Bank radio observatory. Back then, the field was marked by swift innovation and brilliant out-of-the-box thinking because these scientists didn’t know what was possible or impossible. Many of our ideas about METI date back to this time.

One of the key tools for finding out if anyone is out there is the famous Drake Equation written in 1961, which is expressed as follows:

N = R* • fp • ne • fl • fi • fc • L

  • N is the number of technological civilizations in our galaxy
  • R* is the average rate of star formation in our galaxy
  • fp is the fraction of stars that have planets
  • ne is the average number of planets that can support life
  • fl is the fraction of those planets that develop life
  • fi is the fraction of planets with intelligent life
  • fc is the fraction of planets with technological civilizations
  • L is the lifespan of these technological civilizations

If you can find the numbers for each of these variables and plug them in, you should have a good idea of how many civilizations are out there for us to talk to. The problem is that even after almost 60 years of research, there are no reliable numbers for any of these variables. True, we know more about stellar evolution, we have discovered thousands of planets orbiting other stars and we do have a better idea of what type of planetary systems there are out there, but the specific numbers remain unknown.

The most important variable is L, which denotes the lifespan of a technological civilization. Even if all the other variables are nailed down, this one will determine the final answer. If such a civilization lasts only about a century, then we may be the only one. If they last for millions of years, there could be millions of civilizations out there. The irony is that we have no way to set L until we actually witness the rise and fall of other technological civilizations.

A telescope at the Green Bank observatory
A telescope at the Green Bank observatory

Our alternative is to take our only example of a planet with intelligent life (Earth) and look for somewhere that’s a relatively close match. That means looking for a single G main sequence star not too close to the galactic center and not too far on the edge. It should have a rocky planet about the size of the Earth with a large moon and sit in its star’s habitable zone.

Such a search would have been beyond our capabilities just a few decades ago, but modern exoplanet-hunting techniques have changed the game. True, nothing close to a near-Earth analog has been found (yet) and the nature of planet hunting tends toward extreme examples, but the ongoing planetary surveys have allowed us to eliminate many systems as candidates in the same way as the Mars and Venus probes put paid to any future projects to contact Venusians and Martians.

It would be nice if the Drake Equation was more tractable, because if we knew how probable another civilization was, we would know how likely it is that one was within a hundred light years of us. If it is very probable, then the probability of another civilization in our neighborhood increases. If it’s improbable, then such a civilization could be thousands or even millions of light years away, if it’s out there at all.

One of the original radio telescopes at Green Bank
One of the original radio telescopes at Green Bank

On the bright side, since we don’t know, we have no reason not to send our message to nearby candidate stars unless our surveys show they have no Earth-like planets orbiting them. According to some estimates, there are 19 G-type stars within 10 parsecs (32 light years) of Earth, with the nearest only four light years away, so we have some to start with. And with hundreds of million more in the galaxy, we won’t run out anytime soon.

Are aliens watching Hitler on the telly?

The next question is, how are we going to send our message? The obvious answer is radio. But it’s not a matter of pressing the mic button and starting to talk. One common misconception fostered by a certain movie is that radio communication with the stars is so easy that we’re doing it now without our knowledge. Are the inhabitants of some planet about 80 light years from Earth watching television broadcasts of Adolph Hitler opening the 1936 Berlin Olympics? Very probably not.

There are many different kinds of radio and most of them are unsuitable for communicating with the Moon, much less the stars. True, we can communicate with a deep space probe 11 billion mi (19 billion km) from Earth, but that’s because we use very powerful transmitters on Earth focusing a very tight beam, while the receivers are giant dishes precisely aimed at the transmitting spacecraft.

Other forms of radio don’t have a hope. AM transmissions simply can’t cover much distance and shortwave broadcasts bounce off the Earth’s ionosphere. As for television broadcasts, they can travel beyond our atmosphere and into deep space, as can very powerful military radars. For decades, these have been blasting out into space in a bubble that now has a radius of about a hundred light years.

The 1936 Summer Olympics in Berlin were the first to be televised
The 1936 Summer Olympics in Berlin were the first to be televised

At first, this makes the Earth seem like a bright radio beacon with aliens 50 light years away able to tune into Star Trek on a weekly basis. But the problem is two-fold. First, the television and similar transmissions are being broadcast in all directions, meaning that their strength is weakened by the factor of the radius squared. This means that the entire Earth from, for example, 1966 would have a brightness of 10-55 watts per square centimeter at a distance of 10 light years. That’s ten million times too faint to be detected at all, much less not be lost in all the background static. To be picked up at 100 light years, a television broadcast would need 1020 watts behind it.

It gets even worse. These broadcasts are coming from fixed spots on the Earth, which is rotating and revolving around the Sun. This makes the signals intermittent and subject to Doppler effects that distort them. Then there’s the effect of distortion by the Earth’s atmosphere, the Earth’s magnetic field, the Sun’s magnetic field, other stars, interstellar dust and gas, energetic objects, and the omnipresent cosmic microwave background radiation (CMBR) left over from the Big Bang. Add all that together and Hitler’s cosmic broadcast petered out at less than two light years.

What we are talking about here are the ultimate limits of radio communications. Despite having been at this for a little over a century, we’re already close to these limits and anyone else out there will likely be, too. This means that so long as we’re sending out electromagnetic waves, we’re likely on a level playing field no matter how advanced the other party is.

Designing the transmitter

To communicate with the stars, we need to consider three factors. First, the transmission, which must be in the form of a directed, monochromatic beam. Second, the power behind that beam must be high enough to carry information. And third, the frequency of the beam must be able to penetrate space for thousands of light years, yet have enough bandwidth to carry a message.

Ideally, the best system would be one where we design both the transmitter and receiver. Of course, we can’t do this for the first message, but there’s no reason why that message can’t include instructions on how to build a compatible receiver.

The transmitter we’d use isn’t too hard to figure out because we’ve already built several of them in the form of the radio telescopes at Arecibo in Puerto Rico, Jodrell Bank in England, and Pingtang in China, among others. To these giant dishes can be added arrays of multiple dishes, including the Very Large Array and the Allen Telescope Array.

The Arecibo radio telescope
The Arecibo radio telescope

One requirement for setting up a communication base is that it needs to be in a radio quiet zone where even mobile phone use is heavily restricted. The scene in Contact where Jodie Foster’s character is excitedly shouting orders into a walkie talkie about the message from space she’s discovered as she drives by the radio telescope dishes would have been more realistic if her colleagues at the other end angrily shouted back for her to shut up because she’s drowning out the signal.

Choosing a frequency

The next step is choosing what frequency to transmit at, which is a mixture of technical details, economy, and second guessing whoever is listening.

One premise that SETI scientists work on is astronomer Frank Drake’s Principle of Economy, which, to put it simply, is anyone we’re likely to contact will be economical and minimize the personnel, materials, and energy to achieve their ends. In other words, their bureaucrats will be as penny pinching as ours because a species that is careful with its resources will have a better survival advantage.

This means that the aliens will also assume that the frequency we choose will be the one that conserves transmitter power and costs the least energy per bit to send. At the same time, the frequency needs to be easy to generate and detect, not susceptible to much deflection, interference, or absorption by interstellar dust and gas. One other factor that helps whittle down the options is that the signal has to go through our atmosphere and we assume that the receiver is inside a similar habitable atmosphere.

Leaving out the math, the most likely band to achieve all this is between 1,000 and 10,000 MHz. The problem is that there are nine billion frequencies in this range, so which to choose? The answer is to pick one that would be recognized anywhere in the universe. SETI researchers consider two in what is called the “watering hole” as the most likely. That is the frequency of neutral hydrogen at 1,420 MHz and the Hydroxyl (OH) radical frequency at 1,721 MHz. Since Hydrogen is the most common element in the universe, and combining H with OH produces H₂O, these are most likely spots on the spectrum that someone will be listening to.

Diagram of the radio spectrum showing communication windows
Diagram of the radio spectrum showing communication windows

“Nature has provided us with a rather narrow band in this best part of the spectrum that seems especially marked for interstellar contact,” said leading SETI advocate Bernard Olive. “It lies between the spectral lines of hydrogen and the hydroxyl radical. Standing like the Om and the Um on either side of a gate, these two emissions of the disassociation products of water beckon all water-based life to search for its kind at the age old meeting place for all species: the water hole. Water-based life is almost certainly the most common form and well may be the only naturally occurring form.

“Romantic? Certainly. But is not romance itself a quality peculiar to intelligence? Should we not expect advanced beings elsewhere to show such perceptions? By the dead reckoning of physics we have narrowed all the decades of the electromagnetic spectrum down to a single octave where conditions are best for interstellar contact. There, right in the middle, stand two signposts that taken together symbolize the medium in which all life we know began. Is it sensible not to heed such signposts? To say, in effect: I do not trust your message, it is too good to be true.”

Lasers, neutrinos and other exotics

But radio isn’t our only option. What about lasers? We’re already experimenting with them for communication with deep space probes, and SETI researchers are looking for signs of someone else using them, too.

Lasers have many advantages. They’re tightly focused, highly directional, and monochromatic. Using an infrared beam focused by a large mirror or array, it could transmit messages at a much higher rate than a radio transmitter. Or it could be used to distort the solar spectrum by tuning the laser in to a stellar absorption band, which would look like an artificial spectral line to an alien astronomer. This would certainly gain attention and it could be made to wink on and off to send messages.

If we want to go further afield, we could use High Energy Particles (HEPs), including gamma rays, neutrinos, gravitons, and tachyons. Some are little more than theoretical, and others pose technological barriers that may never be surmounted, but they potentially have tremendous advantages.

Lasers are another candidate for interstellar communications
Lasers are another candidate for interstellar communications

Neutrinos, for example, would be an ideal communication medium. Sixty-five billion neutrinos emitted by the Sun pass through every square centimeter of the Earth every second and hardly any of them are stopped by the mass of the planet. If we could generate and detect them easily, they would provide us with a transmitter of unlimited range that would be almost impossible to block.

Going even farther afield, we could turn the Sun into a giant beacon by changing its spectrum directly by dumping about 400 tons of some man-made element into a heliocentric orbit. If someone light years away looked at the solar spectrum and saw something like technetium present (an element not found in nature), they’d certainly take notice. Alternatively, Philip Morrison once suggested placing opaque clouds in orbit around the Sun in a pattern that would make it seem to blink or even spell out short messages.

Oddly, one thing we don’t have to worry about for the moment are inadvertent messages. While aliens aren’t watching I Love Lucy, they could still be able to see the radio spectrum of our planet, and until recently it would have seemed very odd. Due to analog TV broadcasts and military radars, for much of the 20th century the Earth had a temperature in the radio band of the spectrum of 300 K (27° C, 80° F). In the absence of those artificial transmissions, for that to be true the Earth’s black-body temperature would need to be 40 million degrees, which is about seven thousand times hotter than the surface of the Sun.

But during the past 20 years, television has switched over to digital, which requires much smaller bandwidths, and more efficient radars have been developed, so the Earth is currently dark. But don’t get too comfortable. As we start moving out into the Solar System, there will be significant deep space traffic being tracked and tight communication beams transmitted, so things will get noisy again over the next generation.

How to write a message

So, we have our transmitter, but what do we say? To avoid the first conversation between worlds descending into awkward small talk about the weather, we need to come up with a message that’s worth listening to. More importantly, it needs to be one the recipient will understand.

It also needs to be a message that will be recognized as a message. It has to be unambiguously artificial and distinctly different from natural sources. This isn’t as easy as it sounds. A regular, repeating pattern in a radio signal may seem like an obvious beacon being transmitted by intelligent life, but radio astronomers keep being caught out by natural phenomena.

The Allen Telescope Array was built as part of the SETI effort
The Allen Telescope Array was built as part of the SETI effort

For example, on November 28, 1967, Jocelyn Bell Burnell and Antony Hewish at the Mullard Radio Astronomy Observatory in Cambridge, England observed a sequence of pulses coming at intervals of 1.33 seconds from the same point in the sky. Though a number of explanations were put forward to explain it, the idea that it might be artificial was reasonable enough for the signal to be nicknamed LGM-1, for Little Green Men.

LGM-1 turned out to be the first pulsar to be discovered, and it highlighted a problem with interstellar communications. Just because something is repeating, regular, or forms an obvious pattern, doesn’t mean there’s an intelligence behind it. Nature is filled with such things and, as the saying goes, although rare things occur rarely, it is also true that rare things occur rarely.

Imagine, as one philosopher put it, that you’re on a train from London to Cardiff. As you look out the window, you see a scattering of white stones in a field on a hillside. Is this an intelligent message? No. Stones show up in places all the time. But what if the stones form a pattern, like a series of lines or a triangle? It might be a message, but there are any number of processes that might arrange stones in an orderly manner that don’t require human intervention.

Now imagine that the stones spell out “Welcome to Wales.” Is this a message? This is much more likely because stones don’t generally form words or phrases, but it’s not outside the realms of possibility that it’s some remarkable coincidence or that we’re imposing our assumptions on what we see.

But what is the stones spell out “Welcome to Wales” and the hillside is just inside the Welsh border? Now the stones aren’t just forming a pattern, they’re expressing an actual true fact that we’re able to identify. It is a message and the probability of it being otherwise is infinitesimal.

Neptune as seen by Voyager 2
Neptune as seen by Voyager 2

So, if we are sending a message by radio, it has to be clearly artificial and it proves this by conveying verifiable facts that the recipient can recognize and understand. The problem is that this assumes some common frame of reference. If it hadn’t been for the Rosetta Stone repeating the same message in both Greek and Egyptian, hieroglyphics would still be as impenetrable today as they were three hundred years ago.

We need a similar Rosetta Stone and since there aren’t any monuments written in both English and Betelgeusian, we need something that is truly universal – science and mathematics.

Our cosmic message must be simple, but it must also show intelligence, so it can’t be just a repeating series of radio pulses. Instead, these pulses can be used to form binary code to convey data. It might be a series of binary numbers equivalent to 1,2,3,5,7,11 for the first prime numbers, or 1,4,9,16,25 for the first squares, or 3,1,4,1,5,9 for pi, or any of a number of other things.

This would certainly tell ET that we’re here and we’re intelligent, but our message can’t just be a string of simple numbers or it will go down as the most frustrating communication of all time. Our message has to be long. Much, much longer than these simple sequences meant as just a way to get attention. The first part might last only a couple of hours or days. The rest of the message would carry on for months.

Basically, what we’re doing is an exercise in anti-cryptology. Where a cryptographer comes up with ways to make a message harder to read or even find, we’re making one that’s as easy as possible to read, yet will still hold the reader’s attention by actually saying something worthwhile.

We could do this by splitting up the message into three types with each type alternating with the other two. To make sure we’re making up for data lost through interference or to take into account those who started listening in the middle of the message, everything would be repeated several times and perhaps on several neighboring frequencies.

The first type is made up of numbers, physical constants, arithmetic, mathematical concepts, formulae, common scientific facts, and a vocabulary. The second type would be language lessons including syntax, grammar, ideas, logic, sentences, paragraphs, and abstract concepts. Of course, this wouldn’t be in English, but more of a kind of binary Pidgin that would be intelligible to both parties.

The third type would be what we actually want to say and we’d only be limited by bandwidth and our own perseverance. We could send a very focused message, the complete sum of human knowledge in a giant encyclopedia, or we could, as the astronomer Fred Hoyle once suggested, send them instructions on how to build a computer and a copy of the software to program it with, creating a kind of electronic ambassador.

The first message

What we’ve discussed so far is what we could do if we wanted to get into some serious interstellar messaging, but it isn’t theoretical or a someday thing. In fact, Earth started sending messages into space almost half a century ago.

The first radio message to be beamed at the stars went out on November 16, 1974 using the 1,000-ft (305-m) dish antenna at the Arecibo Observatory in Puerto Rico as part of a ceremony to inaugurate a major upgrade. That day, under the eye of then-director Frank Drake, at 17:00 GMT the great dish was aimed at Messier 13 (M13) in the constellation of Hercules.

M13 is a globular cluster made up of 300,000 densely packed stars about 25,000 light-years from Earth, but it’s still within range of Arecibo, which is sensitive enough to detect a television station at a range of 1.8 light-years, BMEWS radar at 18 light-years, or its duplicate on the other side of the galaxy.

Carl Sagan was involved in the Arecibo Message, the Pioneer plaque, and the Voyager record
Carl Sagan was involved in the Arecibo Message, the Pioneer plaque, and the Voyager record

Set to 2,388 MHz, the signal shot out in a tight beam with 2 x 1013 watts behind it for two minutes and 49 seconds as 1,679 frequency pulses or bits modulated between two different frequencies to create binary code at 10 bits per second.

Unsurprisingly, 1,679 was not a number pulled out of a hat. It was very carefully chosen by Drake, who wrote the message itself before sending it to his colleague Carl Sagan to see if he could decipher it. One thousand six hundred and seventy-nine is the product of two prime numbers, 73 and 23. This is a vital clue to anyone or anything that intercepts the Arecibo Message, as it’s now known, which we’ve reproduced here.

The Arecibo Message with color added
The Arecibo Message with color added

Being the product of two prime numbers tells the recipient to set the binary numbers into a square 73 bits on one side and 23 bits on the other. There are only two ways to do this. One produces nothing but gibberish. The other forms a very low-resolution image, which is very clear if the binary ones and zeros are replaced with dark and light squares.

The Arecibo message is short, but it includes a lot of information about humans and the Solar System. The top section (colored here in white for clarity, though there is no color in the message) are the numbers one to 10 in binary with a “least significant digit” marker to show where the number begins. Below this, in purple, are the atomic numbers for hydrogen, carbon, nitrogen, oxygen, and phosphorus, which are the basic constituents of DNA.

In the next section, in green, are the formulae for the sugars and bases that make the nucleotides of DNA. These are in the form of sequences of the five elements previously described. Below this are a pair of spirals, in blue, representing the structure of DNA and a center bar, in white, that is the number 4.3 billion in binary, which is the number of nucleotides thought to make up human DNA in the 1970s.

The next section is a bit more obvious, with a stick figure, in red, in the center. Next to it is a bar, in blue, with the height of the average man represented in binary as 14 times the wavelength of the message (126 mm times 14 equals 1.7 m (5.8 ft). On the other side is the size of the human population in 1974 (4.3 billion)

Next, in the yellow, is a chart of the Solar System with a rough representation of each planet’s size. The symbol for Earth, which sits directly under the stick figure and is indented towards it to show a connection.

Finally, at the bottom of the image, is the outline of the Arecibo telescope and the binary representation of its diameter as a multiple of the message wavelength.

Because the Arecibo Message was really a stunt to show off what the telescope could do, it may have been much shorter than the ideal message we outlined above, but it still tells any recipients a lot about us. It shows a common numbering system and implies that we use a decimal system. It also tells them that we are carbon-based lifeforms, that our genetic structure is based on DNA, and something of our biochemistry. The message also shows that we’re bipeds and our size tells them something about Earth’s gravity. In addition, they know something about the structure of the Solar System and the nature of our technology.

Are we better to remain silent?

Since Arecibo, there have been about 12 other attempts to send messages to other civilizations, though none have been very long or repeated too many times. Part of the reason there have been so few and such modest attempts has been partly insufficient radio telescope time, but also the firm opposition of most of the astronomical community to sending such messages at all.

Though the idea of communicating with extraterrestrials has grown in popularity with the public, the SETI field has faced increasing difficulties in getting funding after nearly 60 years of failure, to the point where many researchers regard SETI, while laudable, as a pseudoscience without a subject and without a testable hypothesis.

According to astronomer and science fiction author David Brin, the strenuous efforts of some SETI researchers to keep the organization from being identified with UFOs and little green men has “pushed away a field that was very kind to them — bona fide science fiction” and walled in their community, isolating them from mainstream science. This has made some SETI proponents very sensitive and frustrated, leading some to advocate going straight from listening to shouting out the existence of mankind to the Cosmos in hopes of spurring a reply.

Saturn was visited by the Pioneer and Voyager missions
Saturn was visited by the Pioneer and Voyager missions

The problem is that one never knows who is going to get the message. They could be one of Sir Arthur C Clarke’s godlike, totally altruistic beings; friendly, logical Vulcans; H G Wells’ ravening Martian hordes bent on conquest; or C S Lewis’s demonic creatures motivated by pure evil. It’s this uncertainty that makes most astronomers prefer that sending any message should wait until the matter has been thoroughly discussed at the very least.

The Physicist Stephen Hawking, in an interview with the Sunday Times, said that if the human race is anything to go by, it would be better to remain silent.

“We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet,” says Hawking. “I imagine they might exist in massive ships, having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach.”

Even early studies of the 1960s and ’70s said that one of the top three criteria for a civilization becoming an active transmitting one was having the technology and resources to fend off an alien invasion force or other military threats.

Probe ambassadors

So does this mean that caution dictates that we never try to communicate with another civilization? Not necessarily. There is an alternative – one that we’ve already used to send messages to the stars. It’s slower than radio, but potentially much safer. This surprising competitor was actually the very first to carry a message addressed to some unknown extraterrestrial civilization years before Arecibo. The first will take tens of thousands of years to reach even the distance of the nearest star, if they ever do. Yet in this cosmic tortoise vs. hare race, it has some surprising advantages.

On March 3, 1972, Pioneer 10 lifted off from Cape Canaveral, Florida. Along with Pioneer 11, launched 11 months later, these unmanned deep space probes were tasked with making flybys of Jupiter and Saturn, setting them on a hyperbolic slingshot trajectory that made them the first spacecraft to ever set out from the Solar System, never to return.

Artist's concept of Pioneer 10
Artist’s concept of Pioneer 10

Not wanting to pass up the opportunity to create the most audacious messages in a bottle ever tossed into infinity, NASA turned the Pioneer probes into Earth’s first cosmic emissaries by tacking a gold-anodized aluminum plaque to each one. Measuring 9 x 6 in (229 by 152 mm), these plaques were engraved with a pictogram that may one day become the most important postcard in history, if by some miracle it’s ever found.

First suggested by journalist Eric Burgess and designed and constructed in three weeks by Carl Sagan, his then-wife Linda Salzman Sagan, and Frank Drake, the plaque is the icing on the cake for Pioneer. Since the aliens will already have the inert probe to study at their leisure, the plaque’s job is to provide a bit of context as to where this mysterious spacecraft came from and who sent it.

The Pioneer plaque
The Pioneer plaque

The plaque shows the outline of the Pioneer probe, in front of which stand the nude figures of a man and a woman. The man’s hand is raised in a gesture of greeting, while the woman has one foot set slightly forward to give some idea of how humans move. Below them is a representation of the Solar System with an arrowed line showing that the Pioneer came from the third planet from the Sun. To one side is a strange diagram of spreading lines with binary symbols next to each one, while above this is a figure of two circles separated by a line.

The two humans are probably the most difficult figures to decipher, since we have no idea how much of how we see two dimensional representations is universal and how much is peculiar to us. But the rest of the plaque should give the finders the ability to deduce some basic information about us.

The two circles at the top are a schematic of the “hyperfine transition” of neutral atomic hydrogen. That is, when the spin of the electron and the proton in a hydrogen atom align shift to when they are opposed, which is when the atom emits radio waves at 1,420 MHz. Since hydrogen is universal, this fact should also be universally known.

Diagram of the Pioneer plaque
Diagram of the Pioneer plaque

The clever bit is that 1,420 Mhz is a wavelength of 21 cm and that gives us and the aliens a common yardstick. Underneath the line connecting the two circles is the number one in binary code. Next to the two humans is the number eight in binary, which tells the aliens that humans are 8 x 21 cm tall – a figure that is confirmed by comparing them to the height of the spacecraft drawn behind them. Since the aliens should have the probe as well as the plaque, this allows them to double check their deductions.

The Solar System diagram also includes binary numbers under each planet showing their distance from the Sun.

As to the enigmatic spider next to the humans, this is a map showing the relationship between 14 pulsars identified by binary representations of their periods, with a 15th line showing the distance between Earth and the center of the galaxy. Since the periods of pulsars are precisely measured and their rate of slowdown is also known, the aliens should be able to pinpoint the date of the probe’s launch to within 100 to 1,000 years and our position to within 60 light years. Not exactly a GPS fix, but at least it would get them close enough to find a gas station and ask for directions.

The Pioneer plaque bolted to one of the Pioneer probes
The Pioneer plaque bolted to one of the Pioneer probes

“The Pioneer plaques are destined to be the longest-lived works of mankind,” said Sagan and Drake in 1975. “They will survive virtually unchanged for hundreds of millions, perhaps billions, of years in space. When plate tectonics has completely rearranged the continents, when all the present landforms on the earth have been ground down, when civilization has been profoundly transformed and when human beings may have evolved into some other type of organism, these plaques will still exist. They will show that in the year we called 1973 there were organisms, portrayed on the plaques, that cared enough about their place in the hierarchy of all intelligent beings to share knowledge about themselves with others.”

The Pioneer message is in some ways as simple as the later Arecibo Message, but in other ways is more complex. It has only a few sections intended to convey a few pieces of information, but the resolution is higher than what could be included in a radio message and the pulsar map goes a step further by telling the recipients where and when the probe came from.

Pioneer and Voyager trajectories
Pioneer and Voyager trajectories


In August 1977, the next level of SETI messaging went into space with the first of the two Voyager probes. Voyager 1 and 2 were larger and more versatile spacecraft tasked with a more ambitious mission. Their trajectory not only sent them to Jupiter and Saturn, but also to Uranus and Neptune, then set them on a velocity that is sending them out of the Solar System before their predecessors.

Even 40 years later, the two spacecraft are still partially functional and will continue to operate until the nuclear power system runs out sometime between 2025 and 2030. But even after their electronics go cold, the Voyagers will still have a job as carriers of the most ambitious space message sent so far.

Voyager showing the Golden Record
Voyager showing the Golden Record

Mounted on the fuselage of each Voyager’s main section is the Golden Record. It’s actually a 12-in (30-cm) copper gramophone record plated in gold and sealed in a gold-electroplated aluminum cover. The latter includes an ultra-pure sample of radioactive Uranium 238, which has a half life of 4.468 billion years and provides the finder with an accurate way to calculate how much time has elapsed since Voyager left Earth. To back this up, the cover is etched with the same pulsar map found on Pioneer. Like any user-friendly product, the cover includes an operating manual showing how to use the record as well as a phonograph needle to play it.

Where Pioneer was a simple message, the Voyager record is a flat-out information dump selected for NASA by a committee led by Carl Sagan. Along with lessons in number system, units of measurements, and biochemistry, the record contains 115 images, greetings in various languages, sounds of everyday Earth life, and 90 minutes of music from around the world.

The images are stored using a simple analog technique developed in the 1920s as a way of recording television on audio records. Since television is a made up of a series of still images, this turned out to be an excellent way to store relatively high definition images. The first image is a simple circle that acts as a calibration aid for the finder.

Cover for the Golden Record
Cover for the Golden Record

This is followed by a solar location map; mathematical and physical unit definitions; a tutorial in human biochemistry, anatomy, and reproduction; information about the planet Earth and its structure; images of terrestrial geology, climatic regions, animal life, and plant life. There’s also a large compendium on human life, activities, architecture, eating, technology, and music, as well as printed messages from US President James Carter and UN Secretary General Kurt Waldheim.

It will be a good 40,000 years before any of these probes comes within two light years of any other star systems and odds are that none will be found for millions or even billions of years.

AI ambassadors

But what does this slowpoke approach for sending messages have over light-speed radio signals? Not much at the moment, but while we’re at the physical limits of what radio can do, interstellar travel still has a long way to go. At the moment, we’re limited to using primitive chemical rockets or ion drives that aren’t really suited to the task of jumping between the stars, but that could well change one day, if we’re patient enough.

First contact with extraterrestrial civilizations has long fascinated scientists, philosophers, and writers
First contact with extraterrestrial civilizations has long fascinated scientists, philosophers, and writers

In 1964, Soviet astronomer Nikolai Kardashev came up with a way of classifying civilizations based on how much energy they are able to harness. A Type I civilization is limited to the power available on a single planet – about 4 X 1012 joules. A Type II would be able to use the output of an entire star, which comes out to 4 X 1026 joules. Meanwhile, a Type III civilization would have the output of a galaxy at 4 X 1037 joules.

The more power a civilization has at its disposal, the more efficient it becomes. One interesting point that SETI scientists have found is that when a culture reaches the point beyond a Type I civilization, the difference in efficiency between sending radio messages and sending unmanned probes becomes negligible.

In 1960, Ronald N Bracewell of Stanford University put forward a proposal for using robotic probes rather than sending radio messages as our way of opening contact with other beings. Let’s look an updated version of his idea.

Imagine it’s a few centuries from now when the energy problems of today seem as quaint as a flint or deer antler shortage in Neolithic Britain. Humanity now has so much surplus energy at its command that sending an interstellar probe seems no more farfetched than sending a probe to Pluto does in our day.

But these are far more advanced spacecraft than any we have today. They are larger and more powerful. They are self-refueling, self-repairing, and can even duplicate themselves as required using advanced 3D printing techniques. They are also fully autonomous with computers that have an almost organic level of artificial intelligence.

These probes aren’t very fast, reaching only 10 percent of the speed of light, but they don’t have to be. With no passengers or crew, they can afford to spend a few decades or even centuries getting to their destination. As they approach the candidate star selected by mission control, each probe has the ability to study the system in detail, identify the planets most likely to possess intelligent life, and make an assessment of whether to proceed or carry on to a more promising system.

If a planet does turn out to have a civilization advanced enough to make contact with, the probe would be programmed to discretely stand off and listen to radio, television, and data transmissions. Unlike trying to pick up signals from light years away, the probe could do so from only millions of miles or might even send in scouts to orbit the planet for a closer look and listen.

The Golden Record
The Golden Record

Already the advantages of sending out such a system become obvious. The Bracewell probe would be intelligent enough and programmed with enough precautionary algorithms to determine if the civilization in question is safe to contact or whether it could be more in Earth’s interests to stay silent. It could even remain on station for decades or even centuries as it sends back reports to Earth.

The same watching brief might even apply if it finds a civilization that hasn’t reached a high enough level of technology to communicate with. It could patiently wait and watch as it evolves, then decide whether to communicate as soon as it starts receiving radio transmissions. Or it could leave behind an artifact, as in 2001: a Space Odyssey, that would inform Earth if it was ever disturbed, while the probe itself moves on to more productive targets. Or it might duplicate itself and send the new one on.

If the probe did decide to make contact, it would be in a far better position than someone trying to start a conversation across 100 light years of space. For one thing, the probe would have no trouble making its presence known by blasting a powerful signal at the planet, perhaps re-broadcasting television programs with a six hour delay on the same frequency as the original broadcasts to make clear that this isn’t some kind of an echo.

The Voyager golden record and a US flag that also flew on the missions
The Voyager golden record and a US flag that also flew on the missions

When contact is established, communications would be clear with a minimum of interference and responses would be received in real time. In addition, a probe orbiting the planet would have huge bandwidth at its disposal to send and receive a very large amount of data – much of it in the form of video.

It would also be a simple task for the probe to instruct the natives on how to build compatible transceivers for the most efficient exchanges or to speak directly to Earth. On the other hand, the probe could act as a gatekeeper by relaying messages to Earth and censoring information, like our location, if the indigenes prove untrustworthy.

Because the probe has artificial intelligence, it can adapt its communications to suit the recipient. It could indulge in true conversations with the natives, asking questions and being asked questions in turn as an exercise in both teaching and learning. It could even provide language lessons with suitable feedback. It might even be able to connect directly to the planet’s version of the internet and use deep learning to better understand the culture or even to communicate directly with individuals.

Indeed, these exchanges could make such a probe, in the broad sense, profitable. Instead of blasting energy into space from Earth with no known return on the investment, the probe could send its findings to Earth much more economically. In fact, unlike radio signals, an autonomous probe program would continue operate long after it had been abandoned back on Earth.

It might even act as an insurance policy for our civilization. If Earth is destroyed, then at least our culture might live on – if only as a record, albeit an intelligent record. Or the probe could be programmed with a wide sampling of the human genome and supplied with information on how to construct a biological printer that would allow it to build human cells and clone them. Scientists are already doing this with simple viruses, so it may one day be possible with Homo sapiens. It may even be possible to bioengineer the ova at code level to adapt the colonists to their new environment.

Taking things a step further, there’s no reason why the probe must be mechanical. Today, scientists are able to encode images and even videos on bacterial DNA. Perhaps, in time, some sort of microorganism could be developed with complex messages encoded on it as a form of self-replicating courier placed in small probes or turned into spores and carried on the solar winds into the galaxy. Maybe one day our first message won’t be heard over the radio, but seen through a microscope.

The completed Golden Records
The completed Golden Records

Today, we have a lot more experience beaming messages into deep space as our unmanned missions probe the edges of the Solar System and beyond. We know more about how to send and receive data with a minimum of wattage, how to use tight-beam radio, and how to carry out precise tracking of space objects. We’re even experimenting with laser communications in deep space and looking at new ways to send spacecraft to the nearest stars.

But whatever methods we may adopt in the future, our first messages are already on their way and we’re waiting for the reply. The odds are long, however, and we won’t hear much for about 50,000 years, so there’s time to put the kettle on.

There Are at Least 36 Intelligent Alien Civilizations in Our Galaxy, Scientists Claim!

#Space #UFO #Alien #DrakeEquasion #Galaxy #Extraterrestrial

Humans have long suspected that we are not alone in the universe, and now scientists have said there may be dozens of alien civilizations lurking not too far from Earth. Some of them may even be advanced enough to communicate with us.

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According to a new study in The Astrophysical Journal, scientists at the University of Nottingham estimate that there is a minimum of 36 communicating intelligent alien civilizations in the Milky Way galaxy. 

They say the estimate is actually conservative — it’s based on the assumption that intelligent life forms on other planets in a similar way to how it does on Earth, using what they call the Astrobiological Copernican Limit.The researchers assume that Earth is not special — if an Earth-like planet forms in an Earth-like orbit around a Sun-like star, hosting a civilization that develops technologically in a similar way to humans, there would be approximately 36 Earth-like civilizations in our galaxy. In this case, other technological civilizations would be sending out signals, such as radio transmissions from satellites and televisions, on a similar timeline as humans, also attempting to find other lifeforms. 

“There should be at least a few dozen active civilizations in our galaxy under the assumption that it takes 5 billion years for intelligent life to form on other planets, as on Earth,” lead researcher Christopher Conselice said in a news release. “The idea is looking at evolution, but on a cosmic scale.”

Previous calculations of alien life have been based on the Drake equation, which includes seven factors needed to find the number of intelligent civilizations, written by astronomer and astrophysicist Frank Drake in 1961. The estimates have been extremely broad, ranging from zero to a few billion civilizations. 

The team of researchers in Nottingham refined the equation using new data and assumptions. They found that there are likely between four and 211 civilizations capable of communicating with others, with 36 the most likely number. 

Finding these civilizations is another issue entirely — scientists said they would be thousands of light years away. Our current technology makes it nearly impossible to detect or communicate with possible alien life.

Scientists said that searching for extraterrestrial intelligent life could give us insight into how long our own civilization can survive. The more civilizations we find close to home, the better the chances for humans’ long-term survival. 

“If we find that intelligent life is common then this would reveal that our civilization could exist for much longer than a few hundred years, alternatively if we find that there are no active civilizations in our galaxy it is a bad sign for our own long-term existence,” Conselice said. “By searching for extraterrestrial intelligent life — even if we find nothing — we are discovering our own future and fate.”

Something’s Blinking on the Moon but Nobody Knows What

#space #Moon #Blink #Mystery #TLP

Why Does the Moon Keep Flashing Us?

The moon

The moon has been flashing us, and a new telescope might explain why. (Image credit: Julius-Maximilians-Universität Würzburg)

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There’s something flashing us on the moon, and we don’t know what it is. But that might be about to change.

We have known about the mysterious flashes since at least the late 1960s, when the astronomers Barbara Middlehurst and Patrick Moore reviewed the scientific literature and found nearly 400 reports of strange events on the moon. Small regions of the lunar surface would get suddenly brighter or darker, without obvious explanation. The scientists’ survey of the flashes and dimming, which they called “lunar transient phenomena,” was published in the journal Science on Jan. 27, 1967. (Later, astronomers flipped the words around, terming the events “transient lunar phenomena.”)

“The emitted light is usually described as reddish or pinkish, sometimes with a ‘sparkling’ or ‘flowing’ appearance,” wrote the astronomer A. A. Mills in the March 1970 journal Nature.. “The coloration may extend for a distance of 10 miles [16 kilometers] or more on the lunar surface, with brighter spots 2 to 3 miles [3 to 5 km] across, and is commonly associated with veiling of the surface features. The average duration of an event is some 20 minutes, but it may persist intermittently for a few hours.”

Amateur astronomers can sometimes spot the flashes with the help of a decent telescope, though the flashes are unpredictable and finding one can involve hours or days of waiting.

Mills noted, bafflingly, that the events leave no obvious marks on the lunar surface after they pass.

Scientists have returned to the subject periodically in the five decades since, but without turning up conclusive explanations. These events are now known to happen a few times a week. This year, a new team of astronomers has returned to the question with an observaotry specially designed for the task.

The new instrument observes the moon constantly using two cameras located 60 miles (100 km) north of Seville in Spain. When both cameras spot a flash, according to a statement from the telescope’s designers, they record detailed photos and videos of the events, and send an email to Julius-Maximilians-Universität Würzburg (JMU) in Bavaria, Germany, which runs the telescopes.

The telescope sits in one of these chambers at an observatory in Spain. (Image credit: Hakan Kayal)

The observatory is still under development, according to the statement, with ongoing improvements to its software since it went online in April. Still, researchers have their suspicions as to what it will discover.

“Seismic activities were also observed on the moon. When the surface moves, gases that reflect sunlight could escape from the interior of the moon,” Hakan Kayal, a researcher at JMU and head of the telescope project, said in the statement. “This would explain the luminous phenomena, some of which last for hours.” Kayal said that, given current plans to establish a base on the moon, it’s important to know just what’s going on up there, so folks living at the base can be prepared for their environment.

But even if that base never happens, it would be nice to know why the moon keeps flashing us.

The moon doesn’t lose a lot of staring contests.

But every now and then, Earthlings who train telescopes on the natural satellite get a a real eye-opener: the moon blinks back at them.

A light, often red or pink, may suddenly flash from the darkness. It lasts a mere second. Other times, the seemingly random twinklings go on for hours.

Is it Morse code? Is someone stranded up there? What are you trying to tell us, Man on the Moon?

Scientists have a name for the effect — transient lunar phenomenon, or simply,TLP. But they don’t know much else. Despite flashing moon lights being recorded for decades, scientists remain as baffled as ever about their origin.

A map showing TLP activity on the moon.
A map showing reported sites of TLP, with red dots signifying reddish clouds and all other events represented by yellow dots. Wikipedia

Is there a method to those pulses of light, often emanating from several points of the moon at once? Theories range from meteorites pelting the moon to gasses being vented from deep beneath the surface.

But astronomer Hakan Kayal may have solved this riddle once and for all by literally connecting the dots.

Moon Telescope

Kayal, a professor at Germany’s University of Würzburg, built a moon telescope, deploying it in Spain earlier this year. From its rural base north of Seville, the telescope is mostly free from meddling light pollution, allowing its unflinching eye to remain fixed on the moon.

Make that two eyes. The telescope incorporates dual cameras, each remotely operated from the university campus in Bavaria. When those cameras detect a burst of light, they automatically start recording images, while sending an email to the German research team: The moon is doing that thing again.

But the real sleuthing will be done by software. Kayal’s team is still honing an AI system that will be able to zero in on flashes of light that originate strictly from the moon.

That’s no small task considering the dizzying number of distractions in the night sky — including counterfeit constellations like Elon Musk’s Starlink satellite network.

Scientist Hakan Kayal poses with his lunar telescope.
Hakan Kayal pictured here with the the fully automatic lunar telescope he built. Tobias Greiner/University of Würzburg

But once the lunar telescope’s AI is trained to tune out distractions — it’s expected to be ready in about a year — Kayal says it will be fully tuned into TLP, recording the moon’s every twinkling outburst.

Software Improvements Needed

“One main task for us is to further develop our software for the detection of the events with as low false alarm rates as possible,” Kayal tells Popular Science. “We already have a basic version which works but there are improvements necessary. As the project is not third party-funded yet and only funded by the resources of the university itself, there is not very much manpower for the software. But we have students who can help to improve the software within their study.”

Once those dots are connected, scientists may, for the first time, be able to analyze patterns and come up with a credible theory for that baffling lunar light show.

For now, Kayal has one of his own:

“Seismic activities were also observed on the moon,” he suggests in a press release. “When the surface moves, gases that reflect sunlight could escape from the interior of the moon. This would explain the luminous phenomena, some of which last for hours.”

Alien Technosignature? The Mysterious Star VVV-WIT-08

#Space #Astronomy #VVV-WIT-08 #Unknown #Star #Technosigniture #Megastructure

VVV-WIT-08, Giant Blinking Star, Spotted by Astronomers Near Milky Way

An international team of astronomers has spotted a giant ‘blinking’ star towards the centre of the Milky Way, more than 25,000 light years away. The star, VVV-WIT-08, decreased in brightness by a factor of 30, so that it nearly disappeared from the sky.

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London, June 11: An international team of astronomers has spotted a giant ‘blinking’ star towards the centre of the Milky Way, more than 25,000 light years away. The star, VVV-WIT-08, decreased in brightness by a factor of 30, so that it nearly disappeared from the sky. While many stars change in brightness because they pulsate or are eclipsed by another star in a binary system, it is exceptionally rare for a star to become fainter over a period of several months and then brighten again, the team said.

The researchers believe that VVV-WIT-08 may belong to a new class of “blinking giant” binary star system, where a giant star 100 times larger than the Sun is eclipsed once every few decades by an as-yet unseen orbital companion. 

The companion, which may be another star or a planet, is surrounded by an opaque disc, which covers the giant star, causing it to disappear and reappear in the sky. The study is published in Monthly Notices of the Royal Astronomical Society.

“It’s amazing that we just observed a dark, large and elongated object pass between us and the distant star and we can only speculate what its origin is,” said Sergey Koposov from the University of Edinburgh.

Since the star is located in a dense region of the Milky Way, the researchers considered whether some unknown dark object could have simply drifted in front of the giant star by chance. However, simulations showed that there would have to be an implausibly large number of dark bodies floating around the galaxy for this scenario to be likely.

One other star system of this sort has been known for a long time. The giant star Epsilon Aurigae is partly eclipsed by a huge disc of dust every 27 years, but only dims by about 50 per cent. A second example, TYC 2505-672-1, was found a few years ago, and holds the current record for the eclipsing binary star system with the longest orbital period — 69 years — a record for which VVV-WIT-08 is currently a contender.

The UK-based team has also found two more of these peculiar giant stars in addition to VVV-WIT-08, suggesting that these may be a new class of “blinking giant” stars for astronomers to investigate. There now appear to be around half a dozen potential known star systems of this type, containing giant stars and large opaque discs.

When UFOs Attack – Documented Cases of Hostile Alien Encounters

#UFO #UAP #Alien #hostile #unknown

If there is one misguided theme I have heard repeated many times in and outside of the UFO community, it is the notion that UFOs and extraterrestrials are our benevolent technological and spiritual superiors, who are only trying to watch over us and gently guide human kind from a path of nuclear, biological and ecological self-destruction to an interstellar highway of spiritual enlightenment and prosperity.

This mantra has been repeated ad nauseum ever since the first UFO was sighted and close encounter was experienced. Yet, there is much documented evidence that these aliens, extraterrestrials or inter-dimensional interlopers may not always be benevolent. On the contrary, there is much more proof that these uninvited guests, who boldly penetrate our airspace, have at times kidnapped, injured and killed innocent humans and animals.

Thankfully, this wasn’t the case in the latest, solidly documented close-encounter case recorded in a recently released Pentagon UFO study. The usually mum Department of Defense almost appeared eager to report the Nov. 14, 2004 UFO incident, experienced by former Navy pilot David Fravor, who repeated a familiar story to all of us who have studied the history of Ufology the last 70 years. While flying a routine mission off an aircraft carrier he and other pilots spotted a UFO that made incredibly sharp turns and reached speeds impossible for aircraft using Earth’s technology. As he watched this mystery craft zip away at an extremely high speed, he came to the same conclusion many of his fellow, military pilots have come to: “It was not of this world,” Fravor told various news organizations. He added that no human could have possibly withstood the G force of such a tremendous thrust of sudden acceleration.

In this concise report, I will present to you documented evidence of a pilot unlike Fravor, who suffered harm in such a mysterious encounter. Such incidents are vastly under reported. For example, until I really started researching this subject, I never realized that a U.S. Army pilot became the first known casualty as a result of such UFO aggression. Although the Army denied this, and summarily covered up this horrifying event with no less than three different, ever- morphing cover stories, I will present you with documentation and eyewitness accounts from credible witnesses that prove within a reasonable doubt that on a January afternoon in 1948 hostile extraterrestrials committed an act of war against the United States. It was likely not the first – and certainly – will not be the last.

I will also present evidence that proves that the population of a small island was terrorized and its impoverished residents used as guinea pigs by an alleged flap of UFOs that harassed and injured scores of innocent men and women for a period of months. Some of these unfortunates still carry the scars from burns and wounds that were inflicted upon them by these unknown perpetrators. The proof consists of eyewitness accounts and secret documents that have been leaked out over several decades. Additionally, in this report, I will document numerous cases of aggressive and hostile UFO acts taken against both military and commercial pilots.

As a bonus, I have also included many little known UFO sighting reports from the early 1860’s to the present. Even though some of these are not directly hostile encounters, all of them invaded our airspace and in some cases crash landed, exposing humans to potential injury or death. Plus, I will present documentation of ongoing cattle mutilations that remain a dark mystery but point to either nefarious government and alien culprits — or a collaboration of both. In conclusion, I must warn you that some will not like this report. They will categorize my conclusions as alarmist and sensational. But as always, I leave it up to you the reader to decide.

When UFOs Attack — Documented Cases of Hostile Alien Encounters

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A recently-discovered declassified Australian report analyzes 1,000 UFO encounters of the third kind to understand the kinds of weapons being used against humans and their animals by these visitors — and if they are being used defensively or without provocation. The reports of UFO landing and near landings were complied by the renowned Ufologist and physicist Jacques Vallee, who worked with the late and honorable Professor Hynek. Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force under two projects: Project Sign and Project Blue Book.

3 Weapon Systems

After a thorough analysis of the 1,000 UFO cases from around the world, the report found the existence of three “weapon systems being used by these unidentified visitors:”

  1. a device to interfere with electrical circuits.
  2. a device to induce paralysis.
  3. a heat ray.

Visitors Use of Weapons
The report, which is dated January 1970, sums up the use of weapons by the alleged extraterrestrials against humans and animals in the following manner:

“There is circumstantial evidence that these weapons are at times used deliberately, although mostly in a defensive role. A number of reports allege that a lone car at night has been followed, and after being stopped by a beam, some kind of interaction has developed between the car occupants and the landed craft occupants.

Information is included which deals with residual effects on the environment of the landed craft. It is these residual effects which offer the greatest potential reward to scientific investigation at this stage.

Sampling of 1,000 Cases Analyzed

Here is a sampling of the 1,000 documented cases. As of this writing, the entire 12-page report, can still be read on the National Archives of Australia, but the PDF download feature is currently disabled.

Case #234 France: 3 small humanoids by craft 50 meters away. Small, reddish point of light. Both witnesses paralyzed until craft left. Ignition failure.

Case #249 France: Witness reach 20 meters from dish with 4-foot being in diving suit before being paralyzed. As craft took off, witness thrown to ground.

Case #272 France: Horse lifted [by]10 foot by 5 foot diameter object and was paralyzed 10 minutes. Man at side of horse felt nothing.

Case #279 France: Dog partially paralyzed when approached two helmeted figures near dome.

Case #295 Italy: 4-foot-3-inch being by tree aimed a flashlight beam, paralyzing witness. Action of clenching fist on keys freed him allowing him to attack the intruder who flew away with a soft whir on a conical device.

Case #339 Italy: 3 small humanoids stealing rabbits from cage. Farmer aims rifle which fails to fire and then has to be dropped.

Case #356 Venezuela: Witness came across 6 little men loading boulders into hovering dish. As he started to run away, one of the creatures pointed something at him which gave off a violet-colored light and paralyzed him.

Case #398 Argentina: Dish lands. Air Force man unable to draw gun from holster. Voice in Spanish from craft.

Case #400 Brazil: Man fell paralyzed. Companions see dish with dome top and bottom 50 meters away. Three 5-foot-7-inch men gather samples.7/11/2021 Declassified Australian Report Analyzes Weapons UFOs Use Against Humans – Unknown Boundaries

Case #333 France: Blue dish came close to motorcycle; prickling felt in hand, engine dies and unable to move of speak. They blue light turns off, all o.k.

Again, this is just a sampling, the entire report can be read here, as of this writing. * Sometimes such documents mysteriously disappear. I made jpeg copies, for myself, however, this is a labor-intensive method. But it’s better to be safe than sorry.

Here are copies of the documents I used for this post: