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 170
? May wethink of them as representing a certain early stage in theevolution of the stars, or in the formation of such a systemas our own solar system? Do they, as was long held byastronomers, give us ocular evidence in support of some sortof nebular hypothesis, and are they the existing… … Fig. 1—The Spiral Nebula, N. G. C. 7479. Fig. 2—The Spiral Nebula. Messier 51.
Astronomy
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