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space elevator
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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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Facsimile of one of William Henry Ireland's forgeries, a primitive self-portrait of William Shakespeare(tinted engraving). Published for Samuel Ireland, Norfolk Street, Strand, December 1, 1795. (W.H. Ireland, forgery)
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Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
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Written by
John M. Logsdon
John M. Logsdon is Professor Emeritus of Political Science and International Affairs at George Washington University’s Elliott School of International Affairs. He was a member of the NASA Advisory Council...
John M. Logsdon
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Related Topics:
space exploration
elevator

space elevator, a concept for lifting mass out of Earth’s gravity well without using rockets in which an extremely strong cable extends from Earth’s surface to the height of geostationary orbit (35,786 km [22,236 miles]) or beyond. The competing forces of gravity at the lower end and outward centripetal acceleration at the farther end would keep the cable under tension and stationary over a single position on Earth. It would then be possible to attach a payload to this cable on Earth and lift it by mechanical means to an orbital height. When released at that point, it would have ...(100 of 146 words)

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