A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 424
, until they arelost in the general nebulositywhich forms the head. Dur-ing these processes the nucleuscontinually changes in bril-liancy and magnitude, usuallygrowing smaller and brighterjust before the liberation ofeach envelope. When jets arethrown off, the nucleus seems . „ -ii . . i. ,., Fig.… … 412 COMETS. heads of two comets which behaved quite differently. Fig. 199 isthe head of Donatis comet as seen on Oct. 5, 1858. This cometwas characterized by the quiet, orderly vigor of its action. It didver}- little that was anomalous or erratic, but behaved in all respectswith perfect propriety.…
Astronomy
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