On March 17, 1958 the United States Naval Research Laboratory succesfully launched Vanguard 1 into orbit. Vanguard 1 was the first solar powered satellite, the second satellite launched successfully by the free world, and the fourth orbiting man-made satellite overall.
Today 50 years on, though its transmitters are long silent, Vanguard 1 continues to orbit the Earth as the oldest man-made object in space.
Read more at the Naval Research Laboratory's Tribute Site.
50 years - ~196,000 orbits - by any count, a finest hour in space exploration!
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