Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 606
in doubt for this nebula, it is altogether certain in the caseof another spiral which is edgewise to the earth, and whichSlipher investigated in 1913. Among the stars high veloc-ities are on the whole associated with small masses. If thisis a universal principle, which seems dynamically sound,the… … Fig. 192. — Great Nebula in Andromeda. Photographed by Ritchey with thetwo-foot reflector of the Yerkes Observatory. 560 AN INTRODUCTION TO ASTRONOMY [ch. xiii, 302 speed„and they of course still possess most of their kineticenergy. It has been more than once suggested that the spiral neb-ulae are…
Astronomy
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