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1914
Vesto Slipher presents empirical evidence for the expansion of the Universe based on his observations of the redshifting of spectral lines in galaxies.
Feature Document
Vesto Slipher, “Nebulae,” Proceedings of the American Philosophical Society, 1917
American Philosophical Society via SAO/NASA Astrophysics Data System
Curated Resources
David Eicher, “Remembering V.M. Slipher’s Work at Lowell: The Lowell Observatory Astronomer’s Revolutionary Findings Include the Expansion of the Universe and the Discovery of the Interstellar Medium,” Astronomy, 29 April 2020
Corey Powell, “The Man Who (Almost) Discovered Pluto… and Also (Almost) Discovered the Expanding Universe,” Discover, 12 July 2015
“Vesto Slipher,” Linda Hall Library
William Hoyt, “Vesto Melvin Slipher, 1875—1969: A Biographical Memoir,” National Academic of Sciences Biographical Memoir, 1980
Vesto Slipher, “The Radial Velocity of the Andromeda Nebula,” Lowell Observatory Bulletin, number 58, pages 56-57, 1913
Vesto Slipher, “The Detection of Nebular Rotation,” Lowell Observatory Bulletin, number 62, page 66, 1914
Vesto Slipher, “Spectrographic Observations of Nebulae”, Popular Astronomy, pages 21-24, 1915
Marcia Bartusiak, The Day We Found the Universe, 2009
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