Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 603
Fig. 189. —The Trifid Nebula. The dark lanesby which it is crossed are probably due to inter-vening dark material. Photographed with the ■ Crossley reflector of the Lick Observatory. 556 AN INTRODUCTION TO ASTRONOMY [ch. xiii, 302 material at its periphery eclipses the center and causes… … Fig. 190. — Spiral nebula in Ursa Major fM. 101). Photographed by Ritcheyat the Yerkes Observatory. The spiral nebulae range in magnitude all the way from theGreat Nebula in Andromeda (Fig. 192), which is about 1°.5long and 30 wide, to minute, faint objects,which are barelydiscoverable after long…
Astronomy
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