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 can not 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