The Cosmic Background Radiation Is

question 61

Multiple Choice

The cosmic background radiation is

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

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Definitions:

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