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cosmic microwave background

electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology

en-GB/ˈkɒzmɪk ˈmaɪkɹəʊˌweɪv ˈbækɡɹaʊnd/
en-US/ˈkɑzmɪk ˈmaɪkɹəˌweɪv ˈbækˌɡɹaʊnd/

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electromagnetic wavecosmic background radiationthermal radiationastronomical phenomenon