Cosmic microwave background radiation

In cosmology, the cosmic microwave background radiation (most often abbreviated CMB but occasionally CMBR, CBR or MBR, also referred to as relic radiation) is a form of electromagnetic radiation discovered in 1965 that fills the entire universe . It has a thermal 2.725 kelvin black body spectrum which peaks in the microwave range at a frequency of 160.2 GHz, corresponding to a wavelength of 1.9 mm. Most cosmologists consider this radiation to be the best evidence for the Big Bang model of the universe.
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Noun
1. (cosmology) the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
(synonym) cosmic background radiation, CBR, CMBR, cosmic microwave background, CMB
(hypernym) cosmic radiation
(classification) cosmology, cosmogony, cosmogeny