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Harbinger2001 t1_j6k70oz wrote

Reply to comment by Flash635 in ELI5: How do we know that light is the fastest thing in existence? by Grump-Dog

It’s a bit more well known than that. There is a maximum speed at which anything in the Universe can travel based on the constraints of General Relativity. Things with no mass must travel that speed. Anything with mass is slower. So the only way something could be faster, is if it had negative mass, which does not exist.

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Flash635 t1_j6k7g1q wrote

That we know of.

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Harbinger2001 t1_j6k8e1n wrote

We have a very accurate mathematical model of the universe and it does not have anything in it that requires negative mass.

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