ALL meanings of cosmic microwave background
cos·mic mi·cro·wave back·ground
C c - noun cosmic microwave background electromagnetic radiation coming from every direction in the universe, considered the remnant of the big bang and corresponding to the black-body radiation of 3 K, the temperature to which the universe has cooled. 1
- noun cosmic microwave background (astronomy) Faint thermal radiation that pervades all space and is thought to be the remnants of the big bang. 0