Is time travel possible? According to physicists, yes. Time travel to the future is not only possible, it's been scientifically proven. But what about traveling to the past? Well, that's a little ...

Scientists have gathered concrete evidence that time can be altered, proving that the concept of time travel exists—at least on a microscopic scale. Two researchers from Darmstadt University in ...

NOVA: Do you think that backwards time travel will ever be possible? Hear Sagan via RealAudio Sagan: Such questions are purely a matter of evidence, and if the evidence is inconsistent or ...