You can't go faster than the speed of light,
and so you can't go back in time. This answer is
no cop-out. According the laws of physics as we
know them, there's just no way to go faster than
the speed of light. At best you can get really
close to the speed of light. The faster you
travel, the slower time will pass for you
relative to someone standing still and the more
squashed you'll look relative to that stationary
observer. Unless you are a photon and don't have
any mass, you are stuck travelling slower than
the speed of light for your entire life.
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