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WASHINGTON (AP) - Famed astrophysicist Stephen Hawking has been thinking a lot about the cosmic question, "Are we alone?" The answer is probably not, he says.
One option is that there likely isn't life elsewhere. Or maybe there is intelligent life elsewhere, but when it gets smart enough to send signals into space, it also is smart enough to make destructive nuclear weapons.
Hawking said he prefers the third option:
"Primitive life is very common and intelligent life is fairly rare," he then quickly added: "Some would say it has yet to occur on earth."