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 (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 59
Fig. 24.—Spiral Nebula in Canes Venatici. 52 NEBULAE. … 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 Herschel.They are circular or slightly ellipticalin form, and shine with a planetaryand…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
