Cosmic Background Explorer

NASA space observatory

en-US/ˈkɑzmɪk ˈbækˌɡɹaʊnd ɪkˈsploʊɹɚ/
en-GB/ˈkɒzmɪk ˈbækɡɹaʊnd ɛkˈsplɔːɹə/

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space telescopecosmic microwave background experiment