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Cosmic microwave background
electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology
Pronunciation
/ˈkɑzmɪk ˈmaɪkrəˌweɪv ˈbækˌɡraʊnd/
/ˈkɒzmɪk ˈmʌɪkrəʊweɪv ˈbakɡraʊnd/
Categories
electromagnetic wave
cosmic background radiation
thermal radiation
astronomical phenomenon