Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 601
there are relatively dark and opaque 554 AN INTRODUCTION TO ASTRONOMY [ch. xiii, 301 masses, perhaps nebulous in character, in certain parts of theMilky Way. He has found regions in which the stars seemto be blotted out by obscure material, as is shown in Fig.188. Probably the apparent breaks in… … Fio. 188. — Oij the left a bright nebula (in Cygnus) and on the right adark patch which is probably due to a dark nebula. Photographed byBarnard at the Yerkes Observatory. how matter could be in equiUbrium in any such forms as theluminous matter assumes. 302. Spiral Nebulae. — Spiral nebulae are…
Astronomy
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