Vanguard 1

Author(s): toutatis

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Vanguard 1 is an American satellite that was the fourth artificial Earth-orbiting satellite to be successfully launched (following Sputnik 1, Sputnik 2, and Explorer 1); it was launched March 17, 1958. Vanguard 1 was the first satellite to have solar electric power. Although communications with the satellite were lost in 1964, it remains the oldest human-made object still in orbit, together with the upper stage of its launch vehicle.

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