cosmic microwave background

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 (synset 111461173)
    referred to in: cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe
    is a type of: cosmic radiation - radiation coming from outside the solar system
    same as: cbr, cmb, cmbr, cosmic background radiation, cosmic microwave background radiation

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