Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 482
bly not avariable nebula. NEBULJE AND CLUSTERS. 463 The clusters represented in Figs. 129 and 130 are good examplesof their classes. The first is globular and contains several thousandsmall stars. The central regions are densely packed with stars,and from these radiate curved hairy-looking branches… … Fig. 128.—the ring nebula in lyra. over the telescopic field. This cluster is an excellent example ofthe compressed form so frequently exhibited. In clusters ofthis class the spectroscope shows that each of the individual starsis a true sun, shining by its native brightness. If we admit that…
Astronomy
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