A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae. Offprint from: Proceedings of the National Academy of Sciences, Vol. 15, No. 3, March 1929

by Edwin Hubble

$50,000 · Offered by Sophia Rare Books

Washington: National Academy of Sciences, 1929. Extremely rare offprint issue of Hubble’s landmark paper which “made as great a change in man’s conception of the universe as the Copernican revolution 400 years before” DSB . This paper “is generally regarded as marking the discovery of the expansion of the universe” Biographical Encyclopedia of Astronomers . It established what would later become known

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