Theoretically, there is no end of the universe as it continously expands, as you said. As for what it expands into (as in the surrounding area
'outside' of the universe), I have no idea. As for what kind of infinity it represents, as in a never-ending line or a self-repeating loop, I don't
have a concrete answer for that, either.
We can work out average distances if we correctly calculate the rate of expansion the Universe has (I think this has been attempted). Based on this
calculation, we can measure the static distance between objects and predict how far away they can be from each other over time, based on that rate of
expansion.
I like that question "what is at the center; what causes it to expand?" because I really would like to know the answer, too. What is the force that
causes the entire Universe to continuously grow? I can theorize that this force is part of the shockwave from the original big bang, and background
radiation/dark matter/ether is probably a propnent of such expansion.
[Edited on 5/13/2004 by AlnilamOmega]







