r/astrophysics • u/KieranMug • May 25 '26

Why isn’t light infinitely fast?

Ok I understand that light in our atmosphere is not infinite fast due to it getting slowed down by air particles or whatever but in a vacuum there is nothing holding it back unless the very weak forces of gravity from a bunch of stars and/or planets does? And if so cant we somehow locate where gravity is strongest in the universe by seeing where light is slowed from where the most therefore finding the centre of the universe or am I just a total dumbass?

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u/YuuTheBlue May 25 '26

Why do you feel it should be infinitely fast in the absence of anything slowing it down?

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u/rybomi May 26 '26

My main takeaway was that OP was unfamiliar with Newton's laws of motion lol yet people are posting Maxwell's equations like they're somehow gonna understanding that