Download Astronomy and Cosmogony by James Hopwood Jeans PDF

By James Hopwood Jeans

This moment version, initially released in 1929, is an in depth survey on the vanguard of cosmology and astronomy with specific connection with the actual country of subject, the constitution, composition and life-cycle of stars, and the superstructures of nebulae and galaxies. meant as a rigourously argued medical treatise, each attempt used to be made via denims to render the result of far-reaching developments in cosmology intelligible to a wide diversity of readers.

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28 The Astronomical Survey of the Universe [CH. I correction for the solar motion. C. 6644 is receding with a velocity of 202 kms. C. 47322 is approaching at 141 kms. a second. The majority give spectroscopic evidence of rotation, and in some the rotation is not uniform, the outer layers rotating less rapidly than the inner layers. Irregular Nebulae. 30. " These lie within the confines of the galactic system of stars, and generally shew stars which appear to be caught within them, or are more probably travelling through them, and illuminating the surrounding nebulosity.

1911), p. 246. £ N. H. Kasmuson, "A Research of Moving Clusters," Lund Meddelanden, n. No. 26 (1921). PLATE III Mt Wilson Observatory The Globular Cluster M 13 in Hercules 25-27] Star Clusters 25 Globular Clusters. 27. In a somewhat different category from the moving clusters are the rather mysterious objects known as "globular" clusters. Whereas the moving clusters just discussed are of a pronouncedly flattened shape, the globular clusters appear at first sight to be strictly of the shape that their name implies.

There is no reason to suppose that calcium especially predominates in the chemical constitution of these clouds. They shew the spectral lines of ionised calcium in their spectra, almost to the exclusion of all others, but this is probably a consequence of the fact that the atom of calcium is ionised with less energy than the atoms of other elements (cf. § 51 below). * Publications of the Lick Obs. xni. (1918), p. 96. t Publications of the Dominion Astrophys. Obs. n. S. LXXXIV. (1924), 80. t Astrophys.

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