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cosmic background radiation (s) (noun) (no pl)
Electromagnetic radiation left over from the original formation of the universe in the Big Bang: Cosmic background radiation is the electromagnetic radiation that penetrates the Earth from unspecified origins in deep space.
This entry is located in the following unit: Astronomy and related astronomical terms (page 7)
microwave background radiation (s) (noun) (no pl)
The radiation which fills the universe uniformly in all directions: The peak intensity of the microwave background radiation has said to have had about one millimeter wavelength in the microwave region.

It is interpreted in the "big bang theory" as the remnant of the initial explosion.

This entry is located in the following unit: Astronomy and related astronomical terms (page 16)