cosmic background radiation CBR cosmic microwave background radiation CMBR cosmic microwave background CMB
cosmic_background_radiation%1:19:00:: cbr%1:19:00:: cosmic_microwave_background_radiation%1:19:00:: cmbr%1:19:00:: cosmic_microwave_background%1:19:00:: cmb%1:19:00::
(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