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The Edge, Birth, and End of the Universe... > Why Might Space Be Curved? - Pg. 219

The Multiverse Contains numerous Universes The theory of the multiverse hypothesizes that there are multiple universes outside of our own. Some people hypothesize that hyperspace is a receptacle for the universe (that is, space itself), and they believe that many universes are floating within hyperspace. There are many different theories about how these so-called parallel universes were formed and how they are related to our own universe. As the professor said, though, there is no scientific proof for any multiverse theory, so the kinds of relationships that may exist between universes are unknown. But many scientists nevertheless entertain the idea that the multiverse may form a structure larger than the observable universe. The cosmological principle posits that if viewed from a sufficiently large scale, the proper- ties of the universe are the same for all observers. This means that there is no special place in the universe, that the universe will have the same general appearance from any location, and that the same laws of physics will apply at any location. If we extend our interpretation of this principle, it would seem logical to assume that there could be countless other uni- verses; the idea that our universe is unique is then illogical. In other words, if there were a super-cosmological principle, the idea of the multiverse would not be at all far-fetched. But philosophically, isn't it more than a little strange to believe that other universes must exist? Needless to say, this conjecture has its share of critics as well. The edge, Birth, and end of the Universe...