On Dec. 6, 1957, the Naval Research Laboratory attempted to launch Vanguard Test Vehicle 3, an answer to Sputnik and part of the American effort to put a satellite in orbit during the International Geophysical Year (July 1957-December 1958). Vanguard TV3 was diminutive, weighing only 3 pounds (1.36 kilograms) and only 6 inches (15.24 centimeters)Continue reading “Dec. 6, 1957: Vanguard TV3 explodes”
The post Dec. 6, 1957: Vanguard TV3 explodes appeared first on Astronomy Magazine.
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