Ah thank you :). 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 logi

Ah thank you :). 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.