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
mes farther offthan a star of the sixth magnitude. Now, as light re-quires 120 years to reach us from such a star, the tele-occur? 97. From whom did the planetary nebulae receive their name, and why ?What is their form? Where does one occur? 98. What is the last class ofnebulae ? Describe the… … Fig. 26.—NebulousStar, i Ononis. VAEIABLE NEBULJS. 53 scope referred to penetrates so profoundly into space thatno star can escape its scrutiny, unless at a distance that itwould take light sixty thousand years to traverse. An idea of the extreme faintness of the more distantnebulae may be gathered…
Astronomy
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