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Explorer I
Explorer I
U.S. Explorer 10 satellite
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Key People

Wernher von Braun
Wernher von Braun
German engineer
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James A. Van Allen
American physicist
Pickering, William Hayward; Johnson, Lyndon
William Hayward Pickering
American engineer and physicist

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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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