Re: Is time travel possible?
I'm going to play the devil's advocate here:
Is time travel theoretically possible? Yes. Einstein's theory of relativity works equally well in reverse. To respond to mcrickeo, Hawking also admits that the universe is four-dimensional - In addition to length, width, and volume, there is also time. Thus, if someone was able to find a way to travel back in time, it would probably work. Traversable wormholes are a serious possibility, but are honesly unlikely. However, quantum entanglement is a true possibility and may or may not work for time travel. So yes, time travel is theoretically possible. But theory and actually trying are two different things, wo we may never know if time travel is truely possible.
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