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Einstein formula for traveling near light speed solves to square root of -1 for speeds in excess of speed of light.
Square root of -1 is an imaginary number, which supposedly cannot happen in our universe.
Theory of time travel usually depends of travel faster than speed of light. Assumption is this is not possible in the real world.
Just think how many people would love to go back in time and pay for the abortion Stanley Ann Dunham really needed!