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| a natural body that revolves around a planet such as a moon |
| a low-mass star that emits low to average amounts of light that burn their hydrogen slowly over a long life span |
| Main Entry: | cosmic background radiation |
| Part of Speech: | n |
| Definition: | microwave radiation in the universe, produced during the Big Bang and subsequently thinned and cooled as the universe expanded; also called background radiation |
| Usage: | science |
| cosmic background radiation
Weak radio-frequency radiation traveling through outer space with equal intensity in every direction. It is thought to be residual radiation from a period shortly following the big bang, when the universe was very hot. Also called microwave background. |