I'm trying to get some kind of intuitive understanding of the Big Bang and the expansion of space. Would it be equivalent to think that instead of space expanding, everything in it is getting smaller, including matter, the speed of light etc? In the beginning matter would be too large to exist so it was purely energy, and by now we would've shrunken so much that large voids have formed between smaller islands held together by gravity. Does this way of thinking work, or is there something fundamentally wrong with it? What would make it different from an expanding space? On a large scale, are galaxy groups fixed in space (which is expanding between them), or are they actually moving *through* space? PS. My previous topic was removed because it was interpreted as suggesting a new theory. It's not, I'm just trying to find a good way of seeing the "current" theory more clearly, so I now reworded the question.