Weyl's postulate

   

Weyl's postulate states that the world lines of the galaxies form a three-bundle of non-intersecting geodesics orthonormal to a series of space-like hypersurfaces.

It is a fundamental assumption of the Big bang theory. A rough translation is "that a global time and space coordinate system can be defined, where time is, on average, in some sense locally perpendicular to space".

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