Sputnik 1, launched on October 4, 1957, was the world’s first artificial satellite. Sputnik 2, launched in 1957, carried Laika the dog into orbit, the first living creature in space. Explorer 1, launched January 31, 1958, discovered Earth’s Van Allen radiation belts, proving satellites could do serious science. TIROS-1, launched in 1960, was the first…
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