Originally Posted by Doit2it
The best argument against time travel is that the earth is constantly rotating on it's axis and revolving around the sun. If you only travel an hour in time, the earth will have rotated approximately 1040 miles and revolved 67,000 miles away, so you'd end up adrift in space. So next time you look up and see a bright meteor, it might be a time traveler, left floating in Earth's orbit until we come back around.
Speed around the galactic core and then within our local cluster is nothing to sneeze at either. Therefore, the fastest form of space travel won't be by speeding up, it'll be by slowing down.
And because what goes around comes around is a universal truth, we'll be able to travel anywhere we want using this method.
I think that you're not 100% right though about time travel. I've found that just by laying on the couch, and blinking, I can travel hours into the future.