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I became interested in this question of whether you can build wormholes for interstellar travel. I realized that if you had a wormhole, the theory of general relativity by itself would permit you to go backward in time.

It was quite a surprise when I realized that with a single wormhole you could have time hook up towards the future or towards the past and that you can actually manipulate the wormhole and change how time hooked up.

The most useful form of time travel would be to go back a year or two and rectify the mistakes we made.

I've always been a big fan of time travel, and I'm very into the notion that some day we'll be able to do it. Beam me up!

I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.

Time can behave like another direction in space under extreme conditions.

The energy necessary to create a wormhole or to wrap time into nuts is incredible. It's not for us. It's maybe for our descendants who have mastered the energy of this technology. So if one day, somebody knocks on your door and claims to be your great great great great granddaughter, don't slam the door.

The bottom line is that time travel is allowed by the laws of physics.

Wormholes don't exist because the only way they would exist is if they were seeded with exotic material created by an intelligence far beyond our own. Something would have to make one.

Time travel used to be thought of as just science fiction, but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out.