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cosmic microwave background radiation

Definitions of cosmic microwave background radiation
  1. noun
    (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
    synonyms: CBR, CMB, CMBR, cosmic background radiation, cosmic microwave background
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    type of:
    cosmic radiation
    radiation coming from outside the solar system
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