Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 413
the headof the comet and the continual formation of new ones in the im-mediate neighborhood of the nucleus, they would seem to be dueto a process of evaporation going on from the surface of the latter.Each layer of vapor thus formed rises uj) and spreads out con-tinually until the part next the sun… … Fig. 104.—formation op comets tail. These phenomena were fully observed in the great comet of1858, the observations of which were carefully collected by thelate Professor Bond; of Cambridge. The envelopes of this cometwere first noticed on September 20th, when the outer one was 16above the nucleus…
Astronomy
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