A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 417
instead of following. It is alwaysdirected aivay from the sun, though its precise position and form is tosome extent determined by the comets motion. There is abundantevidence that it is a material substance in an exceedingly tenuous 404 COMETS. condition, which in some way is driven off from the… … Fig. 197. —Naked-eye View of Donatis Comet, Oct. 4,1858. (Bond.) tinually emitted by the nucleus; and sometimes instead of jets thenucleus throws off a series of concentric envelopes, like hollow shells,one within the other. These phenomena, however, are not usuallyobserved in telescopic comets to…
Astronomy
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