Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 167
always turnedaway from the Sun, whether the comet be approaching orreceding from that body. As the comet gets still nearer to the Sun, and there-fore to the Earth, we begin to see in some instances thatthe coma contains a nucleus, brighter than itself; the jets there that both head, and tail are… … are distinctly visible, and some-times the coma consists of aseries of envelopes. This wasthe case in the beautiful cometof 1858; the nucleus was con-tinually throwing off these en-velopes, which surrounded itlike the layers of an onion, andpeeled off, expanding outwardand giving place to…
Astronomy
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