The American Geologist Volume 4

The American Geologist Volume 4

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...belong to the nebula, in the fact that the bright nebular lines crossing the steller spectrum can be traced for some little distance into the nebula, showing that those stars are not merely optically connected with the nebula, but are physically bound up with it, and are very probably condensed out of the gaseous matter of the nebula. It may be mentioned that other nebulae affording the bright lines of gaseity, exhibit stronger continuous spectra, while in the nebula of Andromeda, the continuous spectrum supersedes that of bright lines. This is all intelligible without ignoring the probability of pre-gaseous conditions, and still more without denying nongaseous matter of pre-gaseous origin, coexistent with a conspicuous amount of gaseous matter. If the meteoric theory implies the aggregation of cold stones and sand, it implies equally the evolution of intense heat and resulting gases. So a nebula resulting from impact of single masses would consist similarly of solid and liquid fragments immersed in a gaseous atmosphere of high temperature. If under either theory, the temperature should reduce to a gaseous state, the entire matter of the nebula, that would furnish no reason for assuming that the nebula had been gaseous from the beginning of its existence. To the writer, the present state of knowledge seems to justify the opinion that some nebulae exist in a condition entirely gaseous, and others in a mixed state, while a few seem to have attained throughout, the condition of fire-mist--borne up probably, by a faintly luminous residual gas. It seems further, to justify the theory that all nebulae have had a prenebular his tory--a growth or development from cold, non-luminous states of matter. The difficulty of admitting vast, dark cosmic bodies, ..show more

Product details

  • Paperback | 164 pages
  • 189 x 246 x 9mm | 304g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236513428
  • 9781236513427