has been confirmed to a level of 10^-5 via observations of the temperature of the CMB. At the scale of the CMB horizon, the universe has been measured to be homogeneous with an upper bound on the order of 10% inhomogeneity, as of 1995.

Expansion prediction

The cosmological principle dramatically simplifies the equations of general relativity, giving the Friedmann-Lemaître-Robertson-Walker metric to describe

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