From Mike Wall at LiveScience:
Humanity should be wary of seeking out contact with alien civilizations, Stephen Hawking has warned once again.
For what it’s worth, some other astronomers believe Hawking’s caution is unwarranted. Any alien civilization advanced enough to come to Earth would surely already know of humans’ existence via the radio and TV signals that humanity has been sending out into space since 1900 or so, this line of thinking goes. More.
Hawking airs his concerns in his new documentary, Stephen Hawking’s Favorite Places (paywall)
See also: But surely we can’t conjure an entire advanced civilization?
How do we grapple with the idea that ET might not be out there?
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