I have read that "A universe with a spherical geometry is called a closed universe because a universe with this geometry must be finite" but even after looking up different sources i cannot find an decent explanation of it is finite. I know that a flat universe is just an unbound 3d grid that goes on forever and is therefore infinite, a hyperbolic universe is also infinite because it stretches on forever (i can't really visualize this).(adsbygoogle = window.adsbygoogle || []).push({});

I can't understand a why a spherical universe has to be finite. Would appreciate it if someone could shed some light on this for me.

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# Why does a universe with a spherical geometry have to be finite?

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