Primordial background radiation

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316. Primordial Background Radiation
Radiation from the hot clouds of the big-bang explosion. Because of its large red shift it appears to come from a body whose temperature is only 2.7K.

horizon problem: In cosmology, the circumstance that the primordial background radiation seems much more isotropic than could be explained by the standard big bang theory.

See also: Mercury, Venus, Earth, Mars, Jupiter