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Page 138
... nebula , cooled down , and rushed through another part of the nebula , rendering the nebular gas more luminous than itself . I Since 1892 one Nova after another has shown a spectrum as described above , like a meteor rushing towards us ...
... nebula , cooled down , and rushed through another part of the nebula , rendering the nebular gas more luminous than itself . I Since 1892 one Nova after another has shown a spectrum as described above , like a meteor rushing towards us ...
Page 141
... Nebula and Star - clusters . - Our knowledge of nebulæ really dates from the time of W. Herschel . In his great sweeps of the heavens with his giant telescopes he opened in this direction a new branch of astronomy . At one time he held ...
... Nebula and Star - clusters . - Our knowledge of nebulæ really dates from the time of W. Herschel . In his great sweeps of the heavens with his giant telescopes he opened in this direction a new branch of astronomy . At one time he held ...
Page 142
... nebula after another was resolved into a cluster of minute stars . At that time the opinion gained ground that with increase of telescopic power this would prove to be the case with all nebulæ . In 1864 all doubt was dispelled by ...
... nebula after another was resolved into a cluster of minute stars . At that time the opinion gained ground that with increase of telescopic power this would prove to be the case with all nebulæ . In 1864 all doubt was dispelled by ...
Page 143
... nebulæ is remarkably actinic , so that photography has a specially fine field in revealing details imperceptible in the telescope . In 1885 the brothers Henry photographed , round the star Maia in the Pleiades , a spiral nebula 3 ' long ...
... nebulæ is remarkably actinic , so that photography has a specially fine field in revealing details imperceptible in the telescope . In 1885 the brothers Henry photographed , round the star Maia in the Pleiades , a spiral nebula 3 ' long ...
Page 145
... nebula , and is condensed and heated by condensation until it begins to shine as a star ; that it attains a climax of tempera- ture , then cools down , and eventually becomes extinct . They go so far as to declare that they know what ...
... nebula , and is condensed and heated by condensation until it begins to shine as a star ; that it attains a climax of tempera- ture , then cools down , and eventually becomes extinct . They go so far as to declare that they know what ...
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Common terms and phrases
accurate observations Airy astro Astronomer Royal Astronomia Nova astronomical units attraction axis bright calculations Cape Cassini catalogue centre century comet compute Copernicus diameter discovered discovery earth eclipse epicycles equatoreal error excentric explain fact fixed stars Galileo Greenwich Halley heavenly bodies heavens heliometer Hipparchus Huggins hydrogen hypothesis instruments Johann Kepler John Herschel Jupiter Jupiter's Kepler Laplace Lick Observatory light line of apses line of sight lunar Mars mathematical mean distance mean motion measured Mercury meteor method miles a second moon moon's nebulæ Newton Observatory orbit parallax perihelion period photographic physical planet planetary pole position predicted proper motion proved Ptolemy R. S. Phil records refractor retrograde retrograde motion revolution revolve round ring rotation round the sun satellites seems showed Sirius solar system spectra spectroscope spectrum spots stellar sun-spots sun's surface supposed tables telescope theory tion Trans Tycho Brahe Uranus velocity Venus Verrier zenith