Submitted by Grump-Dog t3_10pfa2s in explainlikeimfive
Harbinger2001 t1_j6k8e1n wrote
Reply to comment by Flash635 in ELI5: How do we know that light is the fastest thing in existence? by Grump-Dog
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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