America’s second satellite, Vanguard 1, was launched into space on March 17, 1958. And though it only blasted off some six months after the Soviet’s Sputnik satellite, Vanguard 1 still remains in orbit — more than 60 years later. This makes it Earth’s longest-orbiting artificial satellite, as well as the oldest human-made object still in
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Site title: Astronomy Magazine: Space News, Observing, Planets, Galaxies