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HUBBLE, Edwin.

Distribution of Luminosity in Elliptical Nebulae.

Contributions from the Mount Wilson Observatory, No. 398.

Published: Washington, DC: Carnegie Institution, reprinted from the Astrophysical Journal, Vol. LXXI, 1930

Stock code: 88480

Price: £1,250

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First separate edition. This article builds on Hubble’s work at Mt. Wilson in 1923 and 24, in which he discovered that the Milky Way was not, as previously believed, the extent of the universe, but just one galaxy among many. Hubble had shown that many “nebulae” were in fact galaxies filled with stars, but at the time this paper was published it was not clear whether the elliptical variety were true nebulae (clouds of gas and dust), or larger galaxies. Here he discusses the use of luminosity measurements in classifying and understanding these elliptical nebulae, but refrains from taking sides in the debate.

Octavo. Original light greenish-blue wrappers printed in black. 1 plates, illustrations and diagrams throughout the text. Punctures to lower wrappers also affecting second half of the text leaves, wrappers slightly toned. A very good copy.

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