Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 604
the basis of their appearance, it must be re-membered that there is no direct evidence whatever atpresent regarding their masses, and the source of their lumi-nosity is quite unknown. It is natural to suppose thatthough a spiral of dimensions comparable to the solar systemmight be produced by the… … Fig. 191. — Spiral nebula in Androm-eda (H. V. 19) presenting edgetoward the earth. Central lineeclipsed by obscure material. Pho-tographed with the Crossley reflectorof the Lick Observatory. 558 AN INTRODUCTION TO ASTRONOMY [ch. xiii, 302 velocity of ejection would cause matter to recede…
Astronomy
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