The Popular Science Monthly 1873-06: Vol 3
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THE POPULAR SCIENCE MONTHLY. JUNE, 1873. THE CONSTITUTION OF NEBULA. By Dr. H. SCHELLEN.! HEN the starry heavens are viewed through a telescope of moderate power, a great number of stellar clusters and faint nebulous forms are revealed against the dark background of the sky which might be taken at first sight for passing clouds, but which, by their unchanging forms and persistent appearance, are proved to be- long to the heavenly bodies, though possessing a character widely dif- fering from the point-like images of ordinary stars. Sir William Her- schel was able, with his gigantic forty-foot telescope, to resolve many of these nebule into clusters of stars, and found them to consist of vast groups of individual suns, in which thousands of fixed stars may be clearly separated and counted, but which are so far removed from us that we are unable to perceive their distance one from the other, though that may really amount to many millions of miles, and their light, with a low magnifying power, seems to come from a large, faint- ly-luminous mass. But all nebulew were not resolvable with this tele- . 2ope, and, in proportion as such nebulw were resolved into clusters of stars, new nebulw appeared which resisted a power of 6,000, and suggested to this astute investigator the theory that, besides tie many thousand apparent nebulw which reveal themselves to us as a complete and separate system of worlds, there are also thousands of real nebulw in the universe composed of primeval cosmical matter out of which future worlds were to be fashioned. Lord Rosse, by means of a telescope of fifty-two feet focus, of his own construction, was able to resolve into clusters of stars many of the nebulw not resolved by Herschel; but there were still revealed to the eye, thus carried farther into space, new nebule beyond the power even of this gigantic telescope to resolve. * Abridged from Schellen’s “Spectrum Analysis.” VOL. 111.—9
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