On April 1, 1960, the newly established National Aeronautics and Space Administration heaved a 270-pound box of electronics into Earth orbit. In those days, getting anything into space was a major achievement. But the real significance of that early satellite, Tiros-1, was not its survival, but its mission: Its sensors were not pointed outward toward deep space, but downward, at the Earth.
Earth, the final frontier.
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