Curiosities of the Sky

A Popular Presentation of the Great Riddles and Mysteries of Astronomy

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Published: 1909
Language: English
Wordcount: 53,158 / 161 pg
Flesch-Kincaid Reading Ease: 48.2
LoC Category: Q
Downloads: 2,679
mnybks.net#: 6232
Genres: Science, Non-fiction
Excerpt

aphs, particularly those of the singular region around the star Rho Ophiuchi. Here are to be seen somber lanes and patches, apparently forming a connected system which covers an immense space, and which their discoverer thinks may constitute a ``dark nebula.'' This seems at first a startling suggestion; but, after all, why should their not be dark nebulæ as well as visible ones? In truth, it has troubled some astronomers to explain the luminosity of the bright nebulæ, since it is not to be supposed that matter in so diffuse a state can be incandescent through heat, and phosphorescent light is in itself a mystery. The supposition is also in accord with what we know of the existence of dark solid bodies in space. Many bright stars are accompanied by obscure companions, sometimes as massive as themselves; the planets are non-luminous; the same is true of meteors before they plunge into the atmosphere and become heated by friction; and many plausible reasons have been found for believing that space contains as ma

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2010.12.07
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