A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 519
Fig. 231. — The Annular Nebula in Lyra. 506 THE NEBULAE. is entirely invisible even with large ones,city has been ascertained in such cases. So far no regular periodi- 890. Their Spectra. — One of the earliest and most remarkableachievements of the spectroscope was its demonstration of the factthat… … Fig. 232. — Spectrum of tbe Gaseous Nebulae. Three of the lines, F, Hy, and h, are due to Hydrogen. One, the faintest ofall, recently discovered by Copeland, seems to be identical with the D3 lineof the solar chromosphere; but the origin of the rest remains unknown.The brightest line of the whole…
Astronomy
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