So, if we accept it may be possible to travel
forward in time…. why can’t we travel backwards? Luckily (for us) there is a
relatively simple reason. Primarily, travelling backward would cause a paradox.

I shall use the oft quoted example, if I travel back and kill my grandfather,
then how could I ever have existed to travel back to commit the terrible crime
in the first place. Chaos theory and the butterfly effect loom large. Secondly,
the scientific world points out that even if we could travel back in time, we
would only be able to go back to the point at which our time machine was first
created. Of course, there is one overriding, critical and probably fatal point.

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No materials known by man in the universe can survive even half-light speed
without being pulled apart by its own atoms!