Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 424
hile thespectra of stars were invariably continuous and crossed with darklines similar to those of the solar spectrum, those of many nebulaswere discontinuous, showing these bodies to be composed of glowinggas. The nebulas have proper motions just as do the stars. Thegreat nebula of Orion is moving… … Compressed Cluster. 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 from both gaseousand solid matter. CHAPTER XXVII. SPECTRA OF FIXED STARS.* 46. Stellar spectra…
Astronomy
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