Definition of background radiation in English:

background radiation

Line breaks: back|ground ra¦di|ation

noun

[mass noun] Astronomy
  • The uniform microwave radiation remaining from the Big Bang.
    More example sentences
    • This microwave interference came to be recognized as cosmic background radiation, a remnant of the Big Bang.
    • We are also exposed to naturally occurring radiation or background radiation.
    • It's called the cosmic background radiation - radiation that originated in that primordial fire ball.

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