I know it probably looks like a completely stupid question.. But I can't find the answer. Hopefully you all can help me out here. Essentially, all galaxies are moving further apart, from each other.. each spot in the universe is said to have the same effect of everything moving further apart from each other. This is known via the numerous red shifts.. But, what is the evidence that disproves it is not space/time that is expanding, but it is the galaxies and all matter are not shrinking, all relative to each other, thus creating the widening gap between galaxies and the red shift that ensues due to this furthering gap?