This lark about the Universe expanding like a balloon being blown up just can't be right if you think it through.

If something went ***BANG***, stuff is thrown out. For the Universe to be expanding in all directions (as we see it.....) and not from a single point, surely "something" would have to remain at the point of "The Big Bang"? If not, there's a big empty space there?

Now, we only know the Universe as we see it, we have no idea just where in the scheme of things we are when looking at the Universe as a whole. We know where we are in relationship to all we can see (or detect), but what lies "beyond", we have absolutely no idea.

I suppose it won't be long before someone theorises that everything in the pre-universe (and it wasn't all in one place) went ***BANG*** all at the same time........ and that everything in the Universe is the same "distance" from the point of the Big Bang because  it all went ***BANG***......