If the universe has a positive curvature, it's a closed universe.
正曲率的宇宙是封闭的宇宙.
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英英释义
Noun
1. (cosmology) a universe in which there is sufficient matter to halt the expansion that began with the big bang and to cause the universe to collapse again; the visible matter is only 10 percent of the matter required for closure but there may be large am