Is Time Travel Possible? If you think it is/isnt please explain why. I was watching a show that made me believe in forward travel and they proved its possible with high speed planes. but backward travel is a whole other world. they say its possible with the right gravitational force but if you were to travel back it would create many paradoxes such as the grandfather paradox. some people think it creates a parralel universe if it were to happen. Personally I think backtravel is impossible becasue someone would have came back already if it were possible. Let me hear what you think about this...