British astrophysicist Stephen Hawking claims in a new documentary that aliens do exist but humans should stay away from them, according to media reports Tuesday.
The physicist, 68, suggested that extraterrestrials exist not just on planets but also in many other parts of the universe, perhaps in the center of stars or even floating in space.
"If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans," Hawking warned in the documentary.
Hawking also suggested that while most aliens are probably microorganisms or simple animals some could be intelligent and pose a threat to humanity.
via Xinhuanet
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