Chaos Panda Wrote:but in regards to the saving girlfriend from car crash situation, your girlfriend would have already been saved by yourself had you been successful in saving her when you travelled back through time, however then you yourself would have to travel back and save her, creating the loop again.

and how would travelling at a very fast speed make time go backwards?

the theory of relativity denotes it, as discovered by Albert Einstein. It has been proven too, with atomic clocks. Two were set, one at an airport, and one in a concorde (when they flew). After a month they met the clocks up and the one on the plane was a few seconds behind the one in the airport. The same has happened when people were sent to space, and came back down again, their clocks were always behind a few seconds.

time and space are linked, not independent of each other, hence the so called time-space continuum.