Washington: Famed astrophysicist Stephen Hawking has been thinking a lot about the cosmic question, "Are we alone?' The answer is probably not, he says. If there is life elsewhere in the universe, Hawking asks why haven't we stumbled onto some alien broadcasts in space, maybe something like "alien quiz shows?' Hawking's comments were part of a lecture at George Washington University on Monday in honor of Nasa's 50th anniversary. He theorized that there are possible answers to whether there is extraterrestrial life.