I watched a documentary the other nighto n time travel. It had a bunch of physicists saying how it is possible.
But they also said that the most likely form would be in computer simulations of the past made by our future descendants. They said that at the rate at which computers are advancing it will eventually be that we have a computer capable of processing an infinite amount of information. This would allow them to reconstruct the past IDENTICALLY to the past. So much so that the beings in this simulation would be exactly like us and would even think that they were us. This means, they say that in all likelihood we are only computer simulations. The odds of us being the originals is unlikely. I don't know if I buy this....but it's an interesting and, to me, a bit scary. It's on some matrix shit.
Also, in the show they explained a way to travel BACK in time something that was meant to be physically impossible. However, because time is meant to be circular if oyu could rotate the universe you could do it. However, since rotating the universe isn't a possibility they said something about orbiting something.....I don't know what they said coz my mum was asking me what a blackhole was...
If any one can explain this bit to me it would be appreciated.