Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 423
ikewise every cluster of stars or nebula that shows agradual condensation or increasing brightness toward a centre. Spherical clusters are probably not more different in size amongthemselves than different individuals of plants of the same species.As it has been shown that the spherical figure of a… … Fig. 208.—Globular Cluster. The maturity of a sidereal system may thus be judged from thedisposition of the component parts. Though we cannot see any individual nebula pass through all itsstages of life, we can select particular ones in each peculiar stage,and thus obtain a single view of their…
Astronomy
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