Time doesn't "go"; time is a dimension, like the three that compose space. Our perception of time as uni-directional not well-understood. Notions of tachyons as moving backward in time are based on applications of time dilation. However, the formula actual leads to imaginary numbers, not negative ones, so it's far from clear that time would necessarily reverse. Also, such an object could not exist in the same three spatial dimensions we do (due to the Lorentz contraction, which would cause the object to disappear out of the dimension of travel), so you couldn't have shot someone with a tachyon bullet anyway.xaos
Perhaps you can explain this - why is that things that are superluminal are assumed to also time-travel?
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