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I mean you can probably imagine cells and extracellular space between them. In biology some things can go through the cell membrane in and out.

What if universe/s are "similar" and some form of "energy" can leave the Universe and go to extra-universal place? And if it has certain amount new baby Universe is born?

Are there some theories that operates with something I have speak above?

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closed as not constructive by John Rennie, Waffle's Crazy Peanut, Qmechanic Mar 19 '13 at 15:19

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What do you mean under "universe"? As it currently stands, it seems to me, you mean the continuation of the usual 3D space under this term. Please clarify. –  Anixx Mar 19 '13 at 14:15
    
Yes, I don't mean the 10th dimension projection. just the classical "bubbles" popping out and crushing if they are too big ;) –  Derfder Mar 19 '13 at 14:18

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Yes, some authors have considered the possibility of our observable universe being embedded in a higher-dimensional one, see this paper for an example.

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