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chus did not include more than 850 stars and (2) Ptolemy most likely obtained
new coordinates for even those 850 stars. The evidence suggests that Ptolemy,
who for over a century has been considered a mere compilator, should be placed
(Left) From Suwar al-Kawak/l al-thabitah ("Book of the Fixed Stars"), executed by '
Abd ar-Rahman Ibn 'Umar as-Sufl, AH 400 (AD 1009-10). In the Bodleian Library,
Oxford (MS Marsh 144, p. 111). (Right) From Johann Bayer's Uranometrla, ...
Neutron stars (probably observed as pulsars) represent a still higher state of
compression in which electrons have been crushed onto protons to form a
degenerate neutron gas. A star is a more or less spherical globe of gas kept in a
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review