[RadioAstronomer]

The best model we have to date for the universe is that it started with the Big Bang and has been expanding ever since. Time itself also started with the Big Bang so there is no "before" the Big Bang.

[linear]

That was one of my questions. Assuming that acceleration beyond the speed of light causes you to travel back in time, won't the universe then be traveling back towards the big bang?

[Theophilus]

"Start" is defined by time, therefore there is no "Start" to time.