Think again. watch that movie to see that things may turn our much worse than you could possibly imagine. Other Answers (23) For one thing, it probably ISN'T possible. But most of the scenarios physicists have come up with as to how it could happen, come with the restriction (as a consequence of how the time travel is supposed to work) that one could only travel as far back as the time when the time machine was constructed. So since we haven't built a time machine yet, even if one could be built in the future, our present time is inaccessible to time travelers. But really, it's probably just because time travel (into the past, at least) is not possible. First off, it isn't very likely mankind will ever achieve this so maybe that's why. Second, credible theories that support the idea of time traveling to the past (like using designer black holes) require some sort of set up to already exist at the time you'd be traveling back to. You can't just go to any spot in space at any time period you want all willy nilly. You need an apparatus already in place at that time period. To try to go to a time period without one would be like trying to call someone who doesn't have a phone. It just doesn't make sense. Since we do not have any custom built black holes hanging around our solar system, we don't have the proper receiving device for such