that the observable universe is spatially flat with an unknown global structure.

Curvature of the universe

The curvature is a quantity describing how the geometry of a space differs locally from flat space. The curvature of any locally isotropic space (and hence of a locally isotropic universe) falls into one of the three following cases:
# Zero curvature (flat)a drawn triangle's angles add up to 180° and the Pythagorean theorem

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