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Two thoughts go through my mind.
One, maybe the universe has always been infinite and the bigbang was an explosion that happened within the Universe. That way the universe itself is not expanding its the material within it that is expanding.
Two, maybe the universe is contained within another space that contains infinite universes. If this is the case it would support some aspects of string theory. If matter in this universe vibrates at a certain frequency and you changed that frequency then it would be possible to slip into another dimension or universe. Some string theorists postulate this notion.
Personally, I think this question is too big for us mere mortals. I think our version of physics is too simplistic to understand this whole issue. If string theory does pan out to accomodate a unified theory then it will no doubt lead to our colonisation of space. However, for now I am happy to know that the universe is expanding and not contracting. Maybe the bigbang did not happen at all. Maybe the matter in our universe was the ejection of matter from a black hole from another universe, and it is expanding as a result of that ejection.
Man I don't know and now my head hurts.
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