Curiosities of the sky, a popular presentation of the great riddles and mysteries of astronomy (1909)
Serviss, Garrett Putman, 1851-1929 · New York, London, Harper & brothers · leaf 123
ts brightness, which makes the ques-tion of their origin still more puzzling; they all showcontinuous spectra, which, as we have before remarked,indicate that the mass from which the light comes iseither solid or liquid, or a gas under heavy pressure.Thus nebulas fall into two classes: the… … NEBULA IN CETUS WHIRLING NEBULA The spectrum of the Andromeda Nebula has beeninterpreted to mean that it consists not of luminousgas, but of a flock of stars so distant that they areseparately indistinguishable even with powerful tele-scopes, just as the component stars of the Milky Wayare…
Astronomy
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