The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 400
ny nebulae (328) present awell-defined circular disk, like that of a planet, and are there-fore called planetary nebulae. Specimens of planetary neb-ulae are shown in Fig. 429. 371. Circular and Elliptical Nebulce. — While manynebulae are circular in form, others are elliptical. The for-mer are… … Fig. 429. 372. Annular Nebulce. — Occasionally ring-shaped nebu-lae have been observed, sometimes with, and sometimeswithout, nebulous matter within the ring. They are calledannular nebute. They are both circular and elliptical inform. Several specimens of this class of nebulae are givenin Fig.…
Astronomy
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