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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Vanguard
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INFOTEXT
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1992-09-01
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294b
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9 lines
An early series of US Earth-orbiting
satellites and their associated rocket
launcher. Vanguard 1 was the second US
satellite, launched 17 Mar 1958 by the
three-stage Vanguard rocket. Tracking of its
orbit revealed that Earth is slightly
pear-shaped. The series ended Sept 1959 with
Vanguard 3.