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If the large-scale Universe appears isotropic as viewed from Earth, the cosmological principle can be derived from the simpler Copernican principle, which states that there is no preferred ( or special ) observer or vantage point.

To this end, the cosmological principle has been confirmed to a level of 10 < sup >− 5 </ sup > via observations of the CMB.

The Universe has been measured to be homogeneous on the largest scales at the 10 % level.