Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 477
icles move across them in the dotted lines. Thediagram shows an ideal simple case, and Fig. 159 an actualphotograph. But if the approach of S were close, or if therewere a partial collision, and if the ejected material should gobeyond S, a very complicated structure would result. The 430 AN… … Fig. 160. — The great spiral nebula in Triangulum (M. 33). Photographedby Ritchey at the Yerkes Observatory. Thus, the suggested explanation of the origin of the spiralnebulae rests upon the existence of a great number of stars,their rapid and somewhat heterogeneous motions whichimply near…
Astronomy
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