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2020-12-30 22:25:05
SLIPHER, Vesto Melvin
Spectrographic Observations of Nebulae, pp. 21-24 in Popular Astronomy, A Review of Astronomy and Allied Sciences, vol. 23, no. 1, January 1915. DISCOVERY OF THE EXPANDING UNIVERSE
Northfield, Minnesota: Goodsell Observatory of Carleton College & London: Wesley & Son, 1915. First edition, journal issue in the original printed wrappers, of this rare and hugely significant paper, in which Slipher anticipated Edwin Hubble in two of his most important discoveries: that the universe is expanding and that the spiral nebulae are separate galaxies outside our own, implying that the universe is vastly larger than our own Milky Way galaxy. Slipher's "systematic observations of the extraordinary radial velocities of spiral galaxies provided the first evidence supporting the expanding-universe theory" (Britannica). "For the eminent cosmologist Fred Hoyle (1915-2001), Slipher's pioneering observations of redshifts [i.e. velocities] should have led to his being credited with the discovery of the expanding universe" (Kragh & Smith, 'Who discovered the expanding universe?' History of Science 41 (2003), p. 143). Slipher's contribution was neatly summarized by the President of the Royal Astronomical Society in 1933, in his closing remarks on the occasion of the awarding of the society s Gold Medal to Slipher: "In a series of studies of the radial velocities of these island galaxies, he laid the foundations of the great structure of the expanding Universe, to which others, both observers and theorists, have since contributed their share". "In August 1914 Slipher delivered a paper on 'Spectrographic observations of nebulae' to a meeting of the American Astronomical Society. He was able to announce that he had collected the radial velocities of fifteen spiral nebulae, and … [Click Below for Full Description]
Bookseller: Landmarks of Science Books [Richmond, United Kingdom]
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