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UndeadPrivateer · 31-35, M
The most recent measurements of the curvature of the universe suggest it is flat, in other words infinite. However the debate is far from settled, there's still a .4% margin of error on those measurements. A universe with positive curvature would be a closed shape and a universe with a negative curvature would be open. In either case, though, I think the answer to that is "something(or maybe even just [i]nothing[/i]) beyond current human understanding." It wouldn't be possible to leave anyhow, as there is no spacetime to move into outside the universe. As well, none of these cases, whether finite or infinite, rules out a multiverse.
