An Introduction to Astronomy
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In our eReader you can find the full English version of the book. Read An Introduction to Astronomy Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book An Introduction to Astronomy
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Most of these nebulae have a spiral structure. . . . While I must leave to others an estimate of the importance of these conclusions, it seems to me that they have a very direct bearing on many, if not all, questions concerning the cosmogony. If, for example, the spiral is the form normally assumed by a contracting nebulous mass, the idea at once suggests itself that the solar system has been evolved from a spiral nebula, while the photographs show that the spiral is not, as a rule, characteriz...ed by the simplicity attributed to the contracting mass in the nebular (Laplacian) hypothesis. This is a question which has already been taken Mip by Chamberlin and Moulton*of the University of Chicago. " While the spirals are almost certainly examples of plan- etesimal organization, those which have been photographed are enormously larger than the parent of the solar system unless, indeed, there are many undiscovered planets beyond trhe orbit of Neptune. But, as Keeler remarked, there is no lower limit to the apparent dimensions of the spiral nebulse, and it is possible that many of them are actually of very moderate size.
What to read after An Introduction to Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Forest Ray Moulton to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Most of these nebulae have a spiral structure. . . . While I must leave to others an estimate of the importance of these conclusions, it seems to me that they have a very direct bearing on many, if not all, questions concerning the cosmogony. If, for example, the spiral is the form normally assumed by a contracting nebulous mass, the idea at once suggests itself that the solar system has been evolved from a spiral nebula, while the photographs show that the spiral is not, as a rule, characteriz...ed by the simplicity attributed to the contracting mass in the nebular (Laplacian) hypothesis. This is a question which has already been taken Mip by Chamberlin and Moulton*of the University of Chicago. " While the spirals are almost certainly examples of plan- etesimal organization, those which have been photographed are enormously larger than the parent of the solar system unless, indeed, there are many undiscovered planets beyond trhe orbit of Neptune. But, as Keeler remarked, there is no lower limit to the apparent dimensions of the spiral nebulse, and it is possible that many of them are actually of very moderate size.
What to read after An Introduction to Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Forest Ray Moulton to read onlineMoreLess
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