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Cosmic microwave background

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

Pronunciation
/ˈkɒzmɪk ˈmʌɪkrəʊweɪv ˈbakɡraʊnd/
/ˈkɑzmɪk ˈmaɪkrəˌweɪv ˈbækˌɡraʊnd/