Agreed it's on the 'magic' scale. For the universe to work, everything (down to the sub-atomic level) has to be moving all the time[1]. To observe movement, yo

Agreed it's on the 'magic' scale. For the universe to work, everything (down to the sub-atomic level) has to be moving all the time[1]. To observe movement, you have to have a timeframe. And everything needs to be moving in the same direction in that timeframe[2]. This is spacetime. To travel backwards in time, you have to 100% break spacetime. As we understand it right now, that's simply impossible. Stephen Hawking didn't believe in backwards time travel, and I'm pretty sure that he knew what he was talking about. --- [1] Even if the item is held at 0 degrees kelvin (absolute zero) and atomic movement has stopped, it's still moving through the universe. [2] i.e. an atom moves X distance in Y seconds.