Launched by the U.S. Naval Research Laboratory, March 17, 1958, Test Vehicle 4 (TV4), better known as Vanguard I, was the second satellite launched by the U.S., the first successful satellite of the Vanguard series, and the first satellite to use solar cell power. It is the oldest satellite still orbiting the Earth.
This post was published on September 4, 2020 11:19 pm
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