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Background radiation
Background radiation is the level of radiation which occurs naturally in the atmosphere or space.
The cosmic microwave background, which is left over from recombination of protons and electrons in the early universe permeates all of space with a temperature of 2.726 kelvin.
See also:
- Timeline of cosmic microwave background astronomy
- Timeline of other background radiation fields
- Timeline of the Big Bang
- Cosmic Background Radiation (http://spaceboy.nasda.go.jp/note/shikumi/e/shi105_housya_e)
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