I believe it looks like this: https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/Speed_of_light That physical limitation on how fast a

I believe it looks like this: https://en.wikipedia.org/wiki/Speed_of_light https://en.wikipedia.org/wiki/Speed_of_light That physical limitation on how fast a mass can move is what keeps causality in check and things like the grandfather paradox from being possible. Edit: now that I think more on it, this is probably a better law that ensures causality: https://en.wikipedia.org/wiki/Entropy#Second_law_of_thermodynamics https://en.wikipedia.org/wiki/Entropy#Second_law_of_thermody...