I have asked this question. Now I wonder what could happen if I take a step further. If space is assumed to be BOTH homogeneous AND isotropic, can I prove that the expansion of the universe is uniform? I tried to add this into my previous question, but people suggest I should open a new thread.
Again, by uniformity, I mean that if I pick three galaxies to form a triangle, then the ratio of the side lengths will never change over time.
This is NOT a duplicate of the previous question, because it is actually a completely different issue.