Aliens don't visit Earth because they find humans stupid and hate green grass, a top scientist has claimed.
Harvard astronomer Professor Avi Loeb believes a space object that flew past our planet in 2017 before swerving around the sun was made by aliens.
He told the Daily Star it could have been junk left by super-smart cocooning ETs or a missing piece of spacecraft as they wouldn't be interested in sending a proper probe.
Prof Loeb has now expanded on his theory on why little green men don't visit us – and reckons humanity should set up UFO detection stations everywhere there have been reported sightings.
The academic said it would be a cheap way of testing out conspiracy theories like the secretive US base Area 51 holding fallen flying saucers.
He told us: "The most common stars in the galaxy are dwarf stars. Most stars are about a tenth of the mass of the Sun and they are also twice cooler than the Sun so they are red.
"They emit mostly infrared radiation and if there is life on planets next to them… that life will have infrared eyes and the grass will not be green on those planets it will be dark red.
"So if you think about interstellar travel agents, they will not market the Earth as a desirable destination because for the infrared eyes of most of the creatures in the Milky Way the green grass is not particularly appealing, they want dark red grass so this could be an explanation for Fermi's Paradox why they don't come to visit us.
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"It's possible that we are not that attractive and we are not very interesting in terms of our intelligence.
"For some reason humans do not cooperate and that's really unfortunate, and it's not a sign of intelligence so I can imagine a much smarter kid on the block."
He added: "The subject of UFOs is of interest to the government because some of the reports might relate to instruments used by other nations, for example the US is not aware of, so they pose a national security threat so there's an interest in exploring what they are.
"I don't believe in conspiracies by the way, if there was anything to do with an alien civilisation the news would have leaked somehow.
"People can report things from personal experience that are not necessarily true.
"We should invest a relatively small sum of money, it will not cost much, in deploying the best instruments we have now in the same sites from where the reports came and monitor the environment for a long enough time."
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