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British physicist Stephen Hawking - Source: Reuters
Professor Stephen Hawking has warned that aliens almost certainly exist but that humans should avoid making contact with them.
He says it is perfectly rational to assume intelligent life exists in the universe, but warned that if aliens make contact with humanity, they may end up raiding the Earth for resources.
He compared the effects of contact with aliens with that of Native Americans when Christopher Columbus landed in the Americas.
Hawking says humans should do all they can to avoid actively trying to communicate with extra-terrestrials.
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