The Cosmic Background Radiation Is

question 102

Multiple Choice

The cosmic background radiation is

• A) the flux of visible radiation contributed to empty space by all visible stars in the universe.
• B) the beam of atomic nuclei,also known as cosmic rays,which rain down continuously on Earth from all directions in space.
• C) the radio noise generated by Earth-bound transmitters,spreading out into space since about 1920.
• D) low-intensity radio noise,with a 3 K blackbody temperature,almost uniform in intensity in all directions.

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