Our universe might be a giant three-dimensional donut, really. - Deepstash

While a perfectly flat universe would extend out to infinity , a flat universe with a multiply-connected topology would have finite size. If we could somehow determine whether one or more dimensions are wrapped in on themselves, then we would know that the universe is finite in that dimension. We could then use those observations to measure the total volume of the universe.

But how would a multiply-connected universe reveal itself?


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