HUBBLE, Edwin. Distribution of Luminosity in Elliptical Nebulae.
Washington, DC : 1930First 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... Learn More£1,250.00
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