cosmic microwave background

== English == === Etymology === It was originally called the primeval fireball. === Pronunciation === === Noun === cosmic microwave background (uncountable, abbreviation CMB) (astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the Big Bang, produced during the epoch of recombination. Alternative form: CμB Holonyms: cosmic background, cosmic background radiation < electromagnetic radiation < radiation Comeronyms: CIRB, CIB, cosmic infrared background; CNB, CνB, CvB, cosmic neutrino background; CGWB, CGB, cosmic gravitational-wave background ==== Translations ====