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The universe refers to the cosmos; all of space-time and that which exists as part of it. Alternatively, it can refer to the observable universe, which only contains the part we can see. Questions tagged with this should ask about physics at scales the size of the universe or specific properties of the universe

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Is it possible for one side of the universe to "meet" the other?

My question is, can the edges of our universe ever join up? Are they already all joined up? as in is our universe really in the shape of a giant donut (yum). or is this shear lunacy? … that expansion (so that it seems from an observable position that the universe is expanding, when really its flexing inside these boundaries). …
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