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Explorer
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Explorer I Explorer I U.S. Explorer 10 satellite
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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Explorer I
Explorer I.
NASA
Explorer I
(From left) William H. Pickering, James Van Allen, and Wernher von Braun raising...
NASA/JPL
U.S. Explorer 10 satellite
U.S. Explorer 10 satellite shown undergoing testing in a National Aeronautics and...
NASA
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