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Almost uniformly distributed omni-directional radiation that's a direct remnant of the Big Bang event, which occurred 13.7 billion years ago, marking the beginning of the Universe. The once infinitely hot thermal radiation has now cooled down to a temperature of only 2.725K and primarily radiates in the microwave region of the electromagnetic spectrum.

WMAP image of the background cosmic radiation (credit:- NASA / WMAP Science Team)

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