|
There is supposed to be a method of constructing a time-machine that works on the principal of warping spacetime using a spinning black-hole.
Whether it's possible to do is beyond me, but one thing I'm willing to accept is that if it is possible, you could never travel back in time to a point before the machine was first built.
If we ever do build one in time, we will be in the happy position of being able to avoid the end of the universe, and exist for all eternity.
|