Project Vanguard

Project Vanguard bụ mmemme nke United States Navy Naval Research Laboratory (NRL), nke bu n'obi were roket Vanguard weba satịlaịtị mbụ n'ime ala orbit dị ala .  [1] dị ka ụgbọ akwa si Cape Canaveral Missile Annex, Florida

Na nzaghachi nata nke Sputnik 1 na 4 Ọktoba 1957, US mmemme mmemme Explorer, nke ndị agha Ballistic Missile Agency (ABMA) tụpụtara na mbụ.  Otú ọ dị, na ndị, Central Intelligence Agency (CIA) na President Dwight D. Eisenhower maara na àmà ndị Soviet na-eme na Sputnik site na foto nledo.  [1] Ya na Jet Propulsion Laboratory (JPL), ABMA wuru Explorer 1 wee malite ya na 1 February 1958 ( UTC ).  Otú ọ dị, tupu ọrụ arụchaa, Soviet Union webatara satịlaịtị nke abụọ, Sputnik 2, na 3 November 1957. Ka ọ dị ugbu a, ike dị egwu nke Vanguard TV3 na 6 Disemba 1957, mere ka ịjụ ndị America mebie ọnọdụ mba ahụ na  Ọsọ Oghere

Na 17 Ma achi 1958, Vanguard 1 mgbasa satịlaịtị nke abụọ otu nke ọma na mbara ala dị ala nke United States.  Ọ bụ satịlaịtị mbụ nwe ike ike.  naanị 15.2 cm (6.0 na) na dayameta na arọ arọ 1.4 n'arọ (3.1 lb), Vanguard 1 akara ya mgbe ahụ- Soviet Premier Nikita Khrushchev dị ka, "Satellite grapefruit".  [1] Vanguard 1, nakwa dị elu nke ụgbọ igba egbe ya, bụ satịlaịtị atọ kacha ochie nke nọ na mbara igwe, dịka ndị bu ụzọ Vanguard, Sputnik 1, Sputnik 2, na Explorer 1, rerela site na orbit..