(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  
<noun.phenomenon>
<noun.phenomenon>
| CBR |   | 
| CMB |   | 
| CMBR |   | 
| cosmic background radiation |   | 
| cosmic microwave background |   | 
| cosmic microwave background radiation |   | 
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