cmb hi i've appreciated your responses on this topic but these have been difficult for me to understand i'm thinking that perhaps my confusion stems from argument s i've heard that physics is local which might mean limiting inertial reference frames to specific and very localized lattices i ask because i do think of these frames as extending uniformly to infinity and i cannot think of a proper reference frame lattice varying over distances in any significant way another possible source of confusion i don't know if this is the case but as i said i'm at a lost to understand your reply is perhaps you are thinking hubble's law isn't uniform when afaik is supposed to involve a spatially uniform expansion observers in different parts of the observable universe should be currently observing basically the same distant red shifts and law