So here's the problem: maintaining a constant velocity requires no outside force, but acceleration does. So, we're seeing everything accelerate away from us.... but why? Where does that force come from?
My reasoning here is that everything is accelerating from everything else since our position in the galaxy isn’t particularly special right? Then the only way for that really to be true would be for space time itself to be growing.
This must be wrong because it feels obvious and testable, simply make 2 satellites, send one to space, then confirm they are the same size when it gets back. And yet I can't find evidence either way.
maybe this is where the c² in the famous equation comes from
>everything is accelerating from everything else
but what about galactic collisions? we are told the big bang did not happen from one single point but instead everywhere at once
One more question: How do we know that each galaxy is actually accelerating and not moving at a constant speed?
I'm seeing some circular logic. As I understand it, we think they are accelerating _because_ we see that galaxies that are farther away are moving faster away from us.
But we just agreed that we expect to see this same observation even if each individual galaxy maintains constant velocity. Apologies. It's a bit late. I'm sorry if I'm missing something incredibly obvious.
My understanding is that basically everything is moving away from us (presumably our reputation precedes us).