eli5: if everything in the universe is constantly revolving at insane speeds, why are the constellations and star patterns the same all the time?
In: Physics
They’re not; constellations change over time. They just change very slowly because they’re extremely far away.
Say you’re in a car zipping down the highway, and you look out the window. Signs on the roadside pass by in an instant, but if you look at a mountain in the distance then there’s barely any motion at all – even though you’re moving at the same speed in both cases. The bigger something is, and the further away it is, the more it needs to move before you notice a change.
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