Originally Posted by Praxus

The only thing that is happening is that certain existents (Galaxies) are spreading apart. That is not the same thing as saying that the Universe - the sum of all that exists - is expanding. Something with no boundries (e.g. the Universe), by definition, can not expand.

I think this is what people mean when they say the Universe is expanding. My only point, is that it is a misuse of the concept of the Universe.

If the Universe - the sum of all that exists - were expanding, it would have to expand into something that doesn't exist for it to expand into.