Quote:
Originally Posted by Fuzz
Is there any theory that allows traveling back thorough time based on what we know? I thought any reasonable theory around time travel conforms to general relativity, in that you would only be able to slow time for yourself, thus appearing to have traveled through time. Logically, I don't know how you can come up with a theory to travel backwards. Practically, once that ability exists, I don't know how we would be blind to it. So I'm actually more on the "aliens" side.
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Yeah, the theories I have read described theoretical time travel more as a rewind than actually being able to navigate it. Living things could only move backwards in time if they already existed in that time and wouldn't be able to change events. Objects could only go back to the point that time travel was invented because you can't change events in the past that weren't already changed in the future (if that makes sense).
Time travel is just highly theoretical and mostly a mind experiment. I don't think most physicists think it is possible at all (expect for moving forward through time at our current rate of course).