"Hello there!" Signal sent may "Cause the Death of Us All"

Stephen Hawking warned against it. But we did it anyway. The consequences? To be determined. Years ago. signals were sent from Earth into outer space to make contact with intelligent extraterrestrial life. "Well, ever since the beginning of TV, or in fact radio really, we've been broadcasting to the Universe," says source. "They know we're here, and they're actually here now - so, really, the point is moot..."