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.
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