Comment by _cerv

This was one of those things that always ruined time travel movies for me. If I went back in time a few hours, would I be floating in the upper atmosphere? Go back few years, am I just floating in space? Does this mean that I can only really travel back to the previous galactic rotation and hope to Sagan that the galaxy both doesn't drift and the both the Sun and our arm of the galaxy are both in the same place?