The Stars: A Study of the Universe |
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Page 60
... stars show a spectrum like that of the sun , namely , a continuous one crossed by dark lines , does not throw any light on the question whether the matter composing the body of the star ... density that light of no colour can pass entirely ...
... stars show a spectrum like that of the sun , namely , a continuous one crossed by dark lines , does not throw any light on the question whether the matter composing the body of the star ... density that light of no colour can pass entirely ...
Page 108
... star , or about 50,000,000 kilometres ( say 30,000,000 miles ) . The mass of the larger body is about twice that of the smaller , and 9 times the mass of the sun . The mean density of the system is a little less than that of air.1 It ...
... star , or about 50,000,000 kilometres ( say 30,000,000 miles ) . The mass of the larger body is about twice that of the smaller , and 9 times the mass of the sun . The mean density of the system is a little less than that of air.1 It ...
Page 192
... of In a few cases an approximate es- the Stars . timate of the density of stars may be made . The method by which this is done can be rigorously Densities of water . set forth only by the use of algebraic formulæ , 192 CONSTITUTION of the ...
... of In a few cases an approximate es- the Stars . timate of the density of stars may be made . The method by which this is done can be rigorously Densities of water . set forth only by the use of algebraic formulæ , 192 CONSTITUTION of the ...
Page 198
... density . Hence , when we derive our results from such systems we shall be making a biassed selec- tion from this particular class of stars . The next difficulty is that the theory which we have set forth assumes the mass of the ...
... density . Hence , when we derive our results from such systems we shall be making a biassed selec- tion from this particular class of stars . The next difficulty is that the theory which we have set forth assumes the mass of the ...
Page 199
... star , gives the apparent semi - major axis of the orbit in seconds of arc . The next column gives ... density of the stars to that of the sun . Actually , it gives the product : Density × brilliancy . A " PER . MAG . p ' SUN'S PER . STAR'S ...
... star , gives the apparent semi - major axis of the orbit in seconds of arc . The next column gives ... density of the stars to that of the sun . Actually , it gives the product : Density × brilliancy . A " PER . MAG . p ' SUN'S PER . STAR'S ...
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Common terms and phrases
actual Algol apical motion appear Aquila astronomers average Beta Lyræ binary systems body bright lines brighter stars brightest brilliancy catalogue celestial sphere centre century chapter cluster colour components conclusion constellation dark lines density determined direction distance double stars earth eclipses emitted equal Eta Aquila fact faint fainter follows galaxy greater Harvard Observatory heavens Herschel hydrogen hydrogen lines increase Kapteyn latter less Lick Observatory limit lucid stars mass measured Milky naked eye nearly nebula number of stars observations Observatory orbit Orion parallactic motion parallax period photographic Pickering planet pole position proper motion question R. A. Dec radial motion ratio remarkable revolving round right ascension seems seen Sirius sixth magnitude solar apex space spectra spectroscope spectroscopic binary spectrum square degrees star-density stellar supposed surface telescope temperature tion tude UNIVERS universe variable stars variation velocity visible wave-length zone
Popular passages
Page 284 - How charming is divine Philosophy! Not harsh and crabbed, as dull fools suppose, But musical as is Apollo's lute, And a perpetual feast of nectared sweets, Where no crude surfeit reigns.
Page 224 - Tis ours to trace him only in our own. He, who through vast immensity can pierce, See worlds on worlds compose one universe, Observe how system into system runs, What other planets circle other suns, What varied being peoples every star, May tell why Heaven has made us as we are.
Page 333 - The book is cleverly written and is one of the best works of its kind ever put before the public. It will be interesting to all readers, and especially to those interested in the study of science.
Page 26 - Now came still evening on, and twilight grey Had in her sober livery all things clad; Silence accompanied; for beast and bird, They to their grassy couch, these to their nests Were slunk, all but the wakeful nightingale ; She all night long her amorous descant sung , Silence was...
Page 121 - It may be glorious to write Thoughts that shall glad the two or three High souls, like those far stars that come in sight Once in a century ; — But better far it is to speak One simple word, which now and then Shall waken their free nature in the weak And friendless sons of men...
Page 262 - To God's eternal house direct the way A broad and ample road, whose dust is gold, And pavement stars...