[kjkjadksj]

If the universe expands at different speeds, is it even possible to determine expansion relative to earth since you don’t have something fixed (since everything is at different speeds) to measure earths local expansion against?

[malfist]

Yes, in fact, because the big bang happened everywhere and not in one central place, pretty much every part of space is moving away from Earth, so movement from earth is a pretty good measurement.

Think of it not as things moving apart, but that space, emptiness, is expanding. Like if you laid the universe out on a sheet of rubber and then pulled at the corners. Everything gets further apart and the expansion is happening everywhere