Astronomy |
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Page 123
... nature to those of the Martian regarding the Earth - Moon pair . Such a double star is called a ' binary star ' or ' visual binary ' . The discovery of binary stars was the first direct evidence that the law of gravitation DOUBLE STARS.
... nature to those of the Martian regarding the Earth - Moon pair . Such a double star is called a ' binary star ' or ' visual binary ' . The discovery of binary stars was the first direct evidence that the law of gravitation DOUBLE STARS.
Page 125
... binary stars . The double star observer is the most altruistic of all astronomers ; very rarely can he see the fruit of his own observations , for he is working mainly for posterity . It may be inquired , why all this labour , DOUBLE STARS ...
... binary stars . The double star observer is the most altruistic of all astronomers ; very rarely can he see the fruit of his own observations , for he is working mainly for posterity . It may be inquired , why all this labour , DOUBLE STARS ...
Page 130
... - ponents are about 80 and 65 times more massive than the sun . A binary star , visual or spectroscopic , is the simplest of all stellar systems . Several stars have been found to be triple or quadruple systems , and one , e 130 DOUBLE ...
... - ponents are about 80 and 65 times more massive than the sun . A binary star , visual or spectroscopic , is the simplest of all stellar systems . Several stars have been found to be triple or quadruple systems , and one , e 130 DOUBLE ...
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absolute magnitudes actually angle apparent magnitudes appear astronomer atmo atmosphere atoms average density axis B-type binary star bright star brighter calculated called celestial Cepheids CHAPTER clouds colour comet comparatively component considerable constellation craters dark deduced diameter direction discovery distance double stars earth earth's orbit earth's surface eclipse galactic centre galactic system galaxy globe globular clusters gravitation heavens hemisphere Herschel hundred Jupiter Kepler's known light light-changes light-curve light-years lines lunar Mars Martian measured Mercury meteors miles per second Milky million miles minor planets moon moon's moving Neptune observations Observatory open clusters orbital periods photographic plate planetary Pluto position proper motions radial velocities revolve ring rotation satellites Saturn scale seen shown similar Sirius solar spectrum solar system space spectra Spectroscopic speed spiral nebulae spots star's stellar stellar distances sun-spot sun's mass sunlight supposed telescope temperature terrestrial tions Uranus variable star Venus violet visible wave-length