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Originally Posted by flstf
I wonder what the nothingness is that the universe (balloon or flat sheet) is expanding into? Is the universe filled space and the nothingness empty space? Are there other universes out there in the nothingness? This infinity stuff is enough to make a sane person crazy.
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It is not expanding into any empty space, that would be part of the universe. The stuff that is outside the universe is not stuff, it is not even space, it is nothing... it is not even empty, it does not exist! It is sometimes difficult to grasp but you cannot think of outside the universe being a place.