Do aliens really exist?
Renowned astrophysicist Stephen Hawking says aliens almost certainly exist but warns it would be a bad idea to contact them. Are we ready for them if they exist?
In a series for the Discovery Channel, Professor Hawking said it was perfectly rational to assume intelligent life exists elsewhere, but warned that aliens might simply raid Earth for resources and then move on.
He said "The real challenge is to work out what aliens might actually be like."
He said that if extraterrestrials visited the planet the outcome would be similar to when Christopher Columbus landed in America, which, he added, didn't turn out well for the Native Americans.
Are there aliens out there capable of communicating with us? If they exist, should we avoid making contact with them?
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