Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 476
Fig. 158. — The origiu of a spiral nebiila. CH. XII, 249] EVOLUTION OF THE SOLAR SYSTEM 429 Now consider the location of all of the ejected materialat a given time after S has passed its nearest point to S.If it has been sent out from S continuously, it will He alongtwo continuous curves,… … Fig. 159.—The great spiral nebula in Canes Venatici (M. 51), showingthe two arms. Photographed by Ritchey at the Yerkes Observatory. 158. These are the arms of the spiral nebula whose indi-vidual particles move across them in the dotted lines. Thediagram shows an ideal simple case, and Fig. 159 an…
Astronomy
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