Cosmic Microwave Backgroun (CMB) (CMB)

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Astrophysics

Radiation filling the universe, remaining from the early, hot phase. (It is sometimes called the "primal glow.") Today this radiation has cooled to 2.73 K and is strongest in the microwave part of the spectrum.

Lawrence Berkeley National Laboratory's Physics Division — The Universe Adventure Glossary retrieved 2014-05-20