Why does faster than light travel violate causality?

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The way I think I understand it, even if we had some “element 0” like in mass effect to keep a starship from reaching unmanageable mass while accelerating, faster than light travel still wouldn’t be possible because you’d be violating causality somehow, but every explanation I’ve read on why leaves me bamboozled.

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Anonymous 0 Comments

We have never found anything that goes faster than c.
So we do not know what should happen.
The math behind this was not intended to explain what should happen at speeds greater than c so it can not tell us anything.
C as a maximum is an axiom therefore has no explanation

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