Time travel is theoretically possible forwards into time, when travelling at/near the speed of light, time dilates. Travelling at speeds this high a trip that to the inside observer seems like 2 years, the outside observer will see 100 years as passing. As far as i know the only ideas of travelling back in time are based on wormholes in space, which are so far theoretical.
p.s time is man made. Yeah.. you think about that
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