Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 602
rms of incandescent sohd or Uquidparticles, perhaps with many larger masses, surrounded bygaseous materials. There is difficulty in explaining theirluminosity, though Lockyer attempted to account for thelight of all nebulae by ascribing it to heat generated by thecollisions of meteorites of which… … 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…
Astronomy
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