Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 468
each ofthe two stars which compose it isitself double. No more strikingidea of the power of the teles-cope can be formed than bypointing a powerful instrumentupon this object. It will thenbe seen that this minute pair ofpoints, capable of being distin-guished only by the most perfect eye, is really… … 450 ASTRONOMY. Revolutions of Double Stars—Binary Systems.— Themost interesting question suggested by double stars is thatof their relative motion. It is evident that if thesebodies are endowed with the property of mutual gravita-tion, they must be revolving around each other, as theearth and…
Astronomy
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