As far as we know there is no such thing as traveling back in time. The past is the past, what's done is done, and we can't go back there or bring the past back. However, light-speed theory, a discipline of Quantum mechanics introduced by Albert Einstein implies that if one were to travel at the speed of light, the rest of existance would age more rapidly than the one traveling at light speed. For example, if you travel at the speed of light for 4 hours, you would only be 4 hours older, but the rest of the world would have aged 10 years or so in your 4 hours, which is basically traveling forward in time. This can be seen in the Disney movie, "Flight of the Navigator". It's just a movie, but that aspect of it is based on an actual scientific theory. The problem is, we have no way yet to bring a person up to the speed of light, so the theory cannot be tested. Even if we could, we can't fathom what the speed of light would do to a human, or if the theory would even work. It should, but we don't know. A lot of science is just theories that are based on theories that are based on theories and so on.
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