Quote:
Originally posted by gigi@Jan 16 2003, 01:24 PM
I guess that is one of the reasons astronauts who have been in space actually live .5 seconds or whatever 'earlier' than everyone else.
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They don't go backwards in time. They go forward in time slower than someone that stays on Earth.
Special Relativity deals with time dilation as it is caused by speed. Travel faster, time goes slower.
General Relativity deals with time dilation as it is caused by the warping of space-time. Time ticks slower near more massive objects.
As far as I know, the only trick anyone has been able to think of regarding going backwards in time requires travelling through wormholes in space that connect to other parts of the Universe through a backdoor. (basically). At least that is the most popular such idea. Kip Thorne at Cal Tech is into this.