File:Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901) (14783953662).jpg

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Identifier: elementsoftheore00whit_0 (find matches)
Title: Elements of theoretical and descriptive astronomy, for the use of colleges and academies
Year: 1901 (1900s)
Authors: White, Charles J
Subjects: Astronomy.
Publisher: New York: J. Wiley & sons
Contributing Library: University of Florida, George A. Smathers Libraries
Digitizing Sponsor: University of Florida, George A. Smathers Libraries with support from LYRASIS and the Sloan Foundation

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as led to the adoption of the nebulartheory by his examination of that class of celestial bodies callednebuhe, some of which presented in his day, and present now,the appearance of masses of nebulous matter. Kecent spectro-scopic examinations of some of these nebulse (Art. 286) go toshow that they are really what they seem to be, masses of incan-descent vapor; and this discovery gives a new interest to the ne-bular hypothesis. Mr. Lockyer, in his Elementary Lessons inAstronomy, says that it may take long years to prove or dis-prove this hypothesis; but it is certain that the tendency ofrecent observations is to show its correctness. Fresh doubts are thrown upon the truth of the nebular hy-pothesis by the discovery of the satellites of Mars (§ 203); sincethe angular velocity of the inner satellite appears to be threetimes as great as the rotation of the planet. A statement of Kirkwoods Law, which may have somebearing on the nebular hypothesis, will be found in the Appen*dix. PLATE IV.
Text Appearing After Image:
1 BIELAS COMET. 2 ENCKES cqmET. COMETS. 3. GREAT COMET OF 1861. 4. DONAHS COMET, 1858. COMETS. 187 X CHAPTER XIII. COMETS AND METEOEIC BODIES.COMETS. 233. General Description of Comets.—A comet is a body ofnebulous appearance and irregular shape, revolving in an orbitabout the sun. Comets have usually been considered to con-sist for the most part of nebulous matter; but the theory haslately been advanced that they are collections of minute meteoricbodies. Comets differ widely from each other in appearance, and nodescription of them can be given to which there will not bemany exceptions. Generally speaking, a comet consists of threeparts: the nucleus, the coma, and the tail. The nucleus and thecoma together form the head. The nucleus is a bright point,like a star or a planet, w hich may be either a solid mass, or a massof nebulous matter of a density greater than that of the rest ofthe comet. The diameter of the nucleus varies considerably indifferent comets: that of the comet of 184

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  • bookid:elementsoftheore00whit_0
  • bookyear:1901
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:White__Charles_J
  • booksubject:Astronomy_
  • bookpublisher:New_York__J__Wiley___sons
  • bookcontributor:University_of_Florida__George_A__Smathers_Libraries
  • booksponsor:University_of_Florida__George_A__Smathers_Libraries_with_support_from_LYRASIS_and_the_Sloan_Foundation
  • bookleafnumber:197
  • bookcollection:universityoffloridaduplicates
  • bookcollection:univ_florida_smathers
  • bookcollection:americana
Flickr posted date
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30 July 2014

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