Is time travel possible?
Mysteries of Science
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The Science of Time Travel
Einstein's special theory of relativity says that time is affected by speed so the faster you go time slows down for you compared to other people. His second theory which took ten years later was called the general theory of relativity and in that theory what Einstein said was that time is Affected by Gravity. The stronger gravity is the more time will slow down, especially at high altitudes.
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