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This paper overviewing the answer to a reasonable question to wonder what the shape of the Universe is. Is it a sphere? A torus? Is it open or closed, or flat? And what does that all mean anyway? Is it doubly curved like a western saddle? What can determine the entire fate of the Universe. Does the Universe go on forever? If not is there some kind of giant brick wall at the edge of the Universe? As it turns out, the answer is both simpler and weirder than all those options. What does the Universe look like is a question we love to guess at as a species and make up all kinds of nonsense

zenodo (cern european organization for nuclear research)

The shape of the universe and it's density parameter; the ratio of the actual density of the universe to the critical density that would be required to cause the expansion to stop