a background of microwave electromagnetic radiation with a black-body spectrum discovered in 1965, understood to be the thermal remnant of the big bang with which the universe began
Examples of 'microwave background' in a sentence
microwave background
The phenomenon was dubbed the "cosmic microwave background radiation.
Barrow, John D. The Origin of the Universe (1995)
It was an American voice asking me: what do you think of the discovery of fluctuations in the microwave background radiation?