Isogash t1_ivusmnm wrote
Reply to comment by [deleted] in A first-of-its-kind experiment simulating the cosmos with ultracold potassium atoms suggests that in a curved, expanding universe pairs of particles pop up out of empty space by marketrent
Gravity doesn't slow down light, it curves spacetime and makes the light need to travel further. The light always travels at the speed of light (in a vacuum.)
Hanflander t1_ivuzokt wrote
No one has ever described this so concisely in my entire life, thank you.
There’s a light bulb going off above my head now but I can’t see anything because of how dense I feel.
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