What is the ultimate implication of the universe expanding into a space that is constantly being created?
Answer
There is no 'outside' for the universe to expand into, as space only exists within the universe.
By definition, the universe is everything. Since 'outside' is a spatial concept, and space only exists within the universe, the expansion is better understood as new space coming into existence everywhere, increasing the internal separation, rather than moving into a pre-existing volume.
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