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If the universe is expanding - what is it expanding into?

what is THAT space called
and why isn't it part of the universe now?

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    Jul 31 2012: I like to think that it isn't the universe but that we become smaller and smaller. Practically, it's the same thing)
    If you consider the idea of multiverse (there's a beautiful talk about it) we could consider this expansion as a "theft" of space (?).

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