I've spent quite a bit of time researching cosmology on here and various other sources (NOT pop science) and although I feel I have a much better understanding in general, there is one specific thing that I just can't get my head around. Is the space between galaxies expanding or is it just the distance between galaxies growing. The reason this seems so confusing is that from posts I've made before I understood it as just the distance between galaxies growing. (at an accelerated rate due to dark energy) and not because there was some property of empty space the was 'expanding' causing the galaxies to move apart. But I read in many posts here that it's the space that is expanding. One of the most popular references is related to photons from distant galaxies that are receding >c won't reach us because the 'space' in between is growing faster than c. Where I would have thought that if it is just the distances growing at a rate >c the photons would still reach us eventually. So can someone help clear this up for me once and for all! I'm sure I'm missing something simple, but I just cant get it!