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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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  • Aug 18 2012: The universe is probably expanding until there is nothing left. If big bang theory is correct then we all live in debris , or in a "nuclear explosion's" mushroom cloud. Logic tells us the dust will eventually disappear , or the debris will be pushed further apart , but don't start making sandwiches.
    Therefore , you are maybe asking us what is nothingness !
    Hmm ...
    I know , but I am not going to tell you , it's my little secret.

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