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.

External links

Cosmic Background Radiation (http://spaceboy.nasda.go.jp/note/shikumi/e/shi105_housya_e.html)

		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 External links Cosmic Background Radiation (http://spaceboy.nasda.go.jp/note/shikumi/e/shi105_housya_e.html)
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