The cosmic microwave background radiation is best described as

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Multiple Choice

The cosmic microwave background radiation is best described as

Explanation:
Radiation left over from the early universe after the Big Bang. It pervades space as a nearly uniform microwave background, cooled to about 2.7 Kelvin since the universe expanded. This relic photons come from the time when matter and radiation decoupled (the era of recombination), and its blackbody spectrum and all-sky presence provide strong evidence for the Big Bang model. It is not just visible light from distant galaxies, nor radiation from cosmic rays, nor emission from solar flares.

Radiation left over from the early universe after the Big Bang. It pervades space as a nearly uniform microwave background, cooled to about 2.7 Kelvin since the universe expanded. This relic photons come from the time when matter and radiation decoupled (the era of recombination), and its blackbody spectrum and all-sky presence provide strong evidence for the Big Bang model. It is not just visible light from distant galaxies, nor radiation from cosmic rays, nor emission from solar flares.

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