No one really knows that answer, except perhaps astrophysicist Zaza Osmanov of Tbilisi State University in Georgia.
He thinks that aliens might be exploring the universe using tiny robots that measure just a single nanometer.
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This is the theory that aliens could send self-replicating spacecraft out into the universe to explore in a risk-free way.
“The conventional approach to the search for extraterrestrial intelligence implies the search for artificial radio signals, or interstellar beacons targeted at the Earth,” Osmanov argues.
In his paper, Osmanov reveals detailed calculations about how it may be possible to spot these nano-robots.
And Osmanov says that they might look just like a comet a few miles across, appearing as infrared light.
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Hollywood and the science fiction books that preceded it have pushed two major narratives of aliens visiting Earth. One narrative is that if aliens visited Earth, they would be friendly and advanced species wishing to share their knowledge of science and medicine with us. The other narrative is that they would be a hostile species staging a takeover of the planet! Study suggests alien probes are too tiny for astronomers ...for...People's Vote march: 'One million' anti-Brexit protesters fill London streets!! The latter is the far more popular idea.
Of course, Dr. Johnson means “alien” in the “foreign” sense in his first example, not literally extraterrestrials! Flipboard: Study suggests alien probes are too tiny for ...flipboard.com/@NYPost/ ...for-astronomers...Study suggests alien probes are too tiny for astronomers to spot New York Post - By Sean Keach Space scientists may have missed alien probes because they're just too small. That's the bold claim from an astrophysicist who reckons we've been …!! However, these historical tragedies could serve as a metaphor! Physicist Suggests The Best Places For Aliens To Study ...for- aliens -to...Imagine you're an alien civilization and you want to study our planet or "regard it with envious eyes", where are the best places to position a probe ? Well, physicist James Benford has an ...!! Newcomers arrive from a distant land, encounter its original inhabitants, and bloody conflict ensues.
More realistically, alien visitation would be a mixed bag. “Even an alien radio signal would affect society in both good and bad ways,” Dr. Johnson said. “On the one hand, we might fight over who gets to send a reply! Aliens May Have Explored The Galaxy And Visited Earth ...www.sciencealert.com/ aliens ...The study accounted for all of these considerations – the calculations assumed that alien civilizations would only settle a fraction of the habitable worlds they encountered. Still, the researchers said, if there are enough habitable worlds, aliens could easily have spread across the galaxy by now.!! On the other [hand], it might make the differences we’ve traditionally fought over seem insignificant.”
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"People often ask me," he said, 'What do you know about the aliens?' and I'm like, 'Man, I tell you, pretty sure I'd know if there were aliens! Alien probes spying on Earth? Scientist warns of possible ...www.sott.net /article/421322- Alien - probes ...Placing the probes too close to Earth might also pose a problem, as Benford argues the ETs would likely wish to remain undetected. The closest co-orbital asteroid appears to be in a stable orbit that will track with Earth for centuries.!! I've not seen any sign of aliens.'"
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The galaxy might be full of micro-machines | Cosmos
It has long been an unspoken tenet of astrobiology that in the absence of confirmed alien technologies it's necessary to imagine some.
This is far from a frivolous pursuit. Rather, it is an attempt to resolve one of the more baffling aspects of human existence, generally summed up as the Fermi Paradox .
In 1950 the famous nuclear physicist Enrico Fermi came up with an interesting point. Given the size and age of the Milky Way, he said, any alien civilisation just a bit cleverer than humanity should by now have had ample time to explore and colonise all of it.
Why, then, with the obvious exception of a couple of dozen befuddled folk in America's more agricultural states, has no one ever seen evidence thereof?
Scanning the skies for the sounds of extraterrestrial radio broadcasts – the basis of the long-running Search for Extra Terrestrial Intelligence ( SETI ) project – has thus far turned up squat. Other research avenues, at least since Fermi's implicit challenge, have focussed on the search for technological evidence.
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