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In page Comoving and proper distances:
"A comoving observer is the only observer who will perceive the universe, including the cosmic microwave background radiation, to be isotropic. Non-comoving observers will see regions of the sky systematically blue-shifted or red-shifted. Thus, isotropy, particularly isotropy of the cosmic microwave background radiation, defines a special local frame of reference called the comoving frame.[citation needed]
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