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cosmic background radiation
Electromagnetic radiation left over from the original formation of the univiverse in the Big Bang.
This entry is located in the following unit: Astronomy and related astronomical terms (page 7)
microwave background radiation
The radiation which fills the universe uniformly in all directions, with a peak intensitiy at 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)