Okay so my theory on time travel is; when approaching the event horizon of a black hole( if you can even make it that far without whatever space craft your traveling in being stretched to it's absolute limit then being torn apart and swallowed) time seems to slow down untill it eventually almost seems to stop, but in reality, in the event horizon times seems to move at normal speed inside of it.But, on the outside looking in it looks as if your not moving at all. The laws of space time break down at the event horizon breaks down becuase there virtually is none. So, when you got back to earth you'd be in the future because you were basically in a place where time stopped or just didn't really exist, but on Earth, everything was still moving and time did work. I'd really like to hear opinions on this topic!