Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 275
Fio. 70.—Spieal Nebula, appear of appreciable size. A planetary nebula isuniformly bright, and often has a well-defined outline, 23* 270 ASTRONOMY. so that it might be mistaken for one of the outer planetsof the solar system. Nebulous stars are so named because they seem tobe surrounded by an… … Fig. 71.—Dumb-Bell Nebula in Vulpecula. occupy positions near the two foci1 of the ellipse. Inother cases the stars seem to be in the centre of a neb- 1 See page 33. CLUSTERS AND NEBULA. 271 ulous mass. These arrangements are too common tobe the results of chance, and it is probable that thereis…
Astronomy
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