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Cosmic background radiation
/kˈɒzmɪk bˈakɡɹaʊnd ɹˌeɪdɪˈeɪʃən/
/kˈɑːzmɪk bˈækɡɹaʊnd ɹˌeɪdɪˈeɪʃən/Cosmic background radiation
01
(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
