Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 331
ortion of the greatnebula in Orion remain unchanged, there are anoma-lous variations in the brightness of different portions of it. Most of the nebulae are too faint to give perceptiblespectra. About half of the spectra thus far examined Spectra,are composed of a few bright lines, which come… … Fig. 140.—The Nebula ofOrion Photographed.Exposure, fifteen minutes. continuous bands of color suchas would be given by heatedliquid or solid bodies, or gasessubjected to great pressure. Afew nebulae give both spectra.Nebulae may contain solid orliquid bodies which are not suffi-ciently luminous to…
Astronomy
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