here's an article i found on Popular Science:
http://www.popsci.com/popsci/science...1498-1,00.html
It explains the theory of time travel..
In a nutshell, we have a black hole that sucks everything around it including space-time matter. To quote the article:
A black hole is infinitely dense, which means that it pulls the fabric of space-time to the breaking point—creating a deep pockmark, complete with a tiny rip at the bottom.
... In 1935, Einstein and his colleague Nathan Rosen developed a scenario in which the tiny rip in a black hole could be connected to another tiny rip in another black hole, joining two disparate parts of space-time via a narrow channel, or throat.
So their theory was that if you could use anti-gravity to hold the black hole open long enough to fit a man or space station through, you would end up in another space-time. Perhaps 1,000,000 years in the future.
Needless to say, i'm VERY skeptical about that!