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Galactic radiation and background

first US orbital surveillance program

Pronunciation
/ɡəˈlæktɪk ˌreɪdiˈeɪʃən ænd ˈbækˌɡraʊnd/
/ɡəˈlaktɪk reɪdɪˈeɪʃən ənd ˈbakɡraʊnd/