Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 387
ud of these minute bodies. Per-haps each one of the minute particles has a little envelope of gasesabout it. The nucleus of the brighter comets may either be a morecondensed mass of such bodies or it may be a solid or liquid bodyitself. If the student has difficulty in reconciling this theory of… … Fig. 195—Elliptic and Parabolic Orbits. smoke, are in fact composed of minute and separate particles of water,carbon and so forth. The gases shut up in the cavities of meteoric stones have beenspectroscopieally examined, and they show the characteristic cometspectrum. This gives a new proof of the…
Astronomy
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