Man Discovers the Galaxies
Columbia University Press, 1984 - Science - 228 pages
Man Discovers the Galaxies describes the development of galactic theories and models of the stellar system from 1900 to 1940. It is written in an interesting and lucid style, lavishly illustrated with photographs & diagrams.
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The Development of Techniques for Determining Distances
Galactic Theories in the Period 19001920
Astronomys Great Debate
Absorption and the Solution of the GalacticScale Problem
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apparent magnitudes Astron Astronomical Society Astrophys calcium Chapter classification clouds conclusion cosmology debate determined diameter discussed distances E. E. Barnard Eddington Edwin Hubble Einstein errors evidence G. E. Hale galactic system Galaxy globular clusters gravitational H. D. Curtis H. N. Russell Hale Observatories Hale Observatories photograph Harvard University Archives Herschel Hertzsprung Ibid indicated internal motions island-universe theory J. C. Kapteyn Jeans km/sec Lick Observatory light lines Lowell Observatory Lundmark Maanen Maanen's measurements Maanen's results Messier 101 Milky motions in spirals Mount Wilson novae observations Oort's open clusters paper parallax Plaskett plates Private communication problem proper motions Publ published radial velocities redshifts region of avoidance scientific scientists servatory Shapley Shapley's Sitter Slipher solar space spectral Spiral Nebula Messier spiral nebulae stellar system structure Struve studies telescope theoretical tion Trumpler V. M. Slipher velocity-distance relation wrote Yerkes Observatory