Definition of "background radiation" []

• Ionizing radiation that is naturally present in the environment. (noun)

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• "9 And Arno Penzias, the Nobel Prize–winning scientist who codiscovered the cosmic microwave background radiation that provided strong support for the Big Bang in the first place, states, “The best data we have are exactly what I would have predicted, had I nothing to go on but the five Books of Moses, the Psalms, the Bible as a whole.”"