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What is Earth’s oldest artificial satellite that's still in orbit?

As America’s second satellite, it was launched into space on March 17, 1958. Though it only launched into space some six months after the Soviet's Sputnik satellite, Vanguard 1 still remains in orbit. Sputnick 1 fell back and burned in Earth's atmosphere.
What is Earth’s oldest artificial satellite that's still in orbit?
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What is Earth’s oldest artificial satellite that's still in orbit?
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