. Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere. Fig. 24.—Spiral Nebula in Canes Venatici. 52 Fig. 25.—Planetary Nebula in Ursa Major. in Messiers catalogue), which indicate the action of stu-pendous forces of a kind unknown in our own universe. 97. Planetary Nebulae. — Thesewere so called by Sir John are circular or slightly ellipticalin form, and shine with a planetaryand often bluish light. One in UrsaMajor will serve
. Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere. Fig. 24.—Spiral Nebula in Canes Venatici. 52 Fig. 25.—Planetary Nebula in Ursa Major. in Messiers catalogue), which indicate the action of stu-pendous forces of a kind unknown in our own universe. 97. Planetary Nebulae. — Thesewere so called by Sir John are circular or slightly ellipticalin form, and shine with a planetaryand often bluish light. One in UrsaMajor will serve as a specimen. 98. Nebulse surrounding Stars.—We come lastly to the nebulae sur-rounding stars, or nebulous stars thus surrounded are ap-parently like all other stars, save in the fact of the presence of the appendage; nor does the nebula give any signs of being resolvable with our present telescopes. Iota (1) Orionis, JEpsilon (e) Orionis, 8 Canum Venaticorum, and 79 Ursce Ma- joris, belong to this class. 99. Brightness of the Nebulse.—Likethe stars, the nebulae differ in brightness, but as yet theyhave not been divided into magnitudes. This, however,has been done in a manner by determining the space-penetrating or light-graspi
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectastronomy, bookyear18
