Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 366
ed in the spectra of differ-ent nebulae : the lines of helium are generally found to be present.One of Mr. Hugginss photographic spectra of the nebula of Orionshows, in addition to those that are visible to the eye, a considerablenumber of bright lines in the ultra-violet; and, what is… … Fig. 119. — Spectrum of the Gaseous Nebulae. Not all nebulae show the bright-line spectrum. Those whichdo — probably only a few hundred — are of a greenish tint,at once recognizable in a large telescope. The white nebulae,most of them spiral in form and greatly outnumbering thegreen, or gaseous…
Astronomy · Constellations
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