The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific (1919)
Astronomical Society of the Pacific, Aitken, Robert Grant, 1864-1951 · San Francisco Stanford University Press · leaf 177
ches, should we find themwhere the stars are fewest, and never occurring where thestars are thickest and where, if at all, close stellar approachesshould be common ? It must be admitted that the evidence at present available,upon which any satisfactory theory of the spiral nebulae maybe based, is… … Fig. 1—The Spiral Nebula N. G. C. 4527. Left: May 8, 1901. Right: April 16, 1915, showing Nova. North
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
