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Cosmic background radiation

type of spectrum apart from the Big Bang, whichever shows the universe

Pronunciation
/ˈkɒzmɪk ˈbakɡraʊnd reɪdɪˈeɪʃən/
/ˈkɑzmɪk ˈbækˌɡraʊnd ˌreɪdiˈeɪʃən/