Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 485
few cases,however, clusters are composed of a mixture of nebulosity (usuallynear their centre) and of stars, and the spectrum in such cases iscompound in its nature, so as to indicate radiation both by gaseousand solid matter. § 5. DISTRIBUTION OF NEBULA AND CLUSTERSON THE SURFACE OF THE CELES-TIAL… … STAR-CLUSTERS. 467 The position of each nebula is marked by a dot; where the dots arethickest there is a region rich in nebulae. A casual examinationshows that such rich regions are distant from the Galaxy, and itwould appear that it is a general law that the nebulae are distri-buted in greatest…
Astronomy
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