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Galactic Radiation and Background

first US orbital surveillance program

en-GB/ɡəˈlæktɪk ˌɹeɪdɪˈeɪʃən ən ˈbækɡɹaʊnd/
en-US/ɡəˈlæktɪk ˌɹeɪdiˈeɪʃən ˈænd ˈbækˌɡɹaʊnd/

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reconnaissance satellite