Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 384
Fig. 192.—Telescopic Comet Fig. 193.—Telescopic Cometwithout a Nucleus and with a Nucleus, but with- without a Tail. out a Tail. When large comets are studied with a telescope, it isfound that they are subject to extraordinary changes. Tounderstand these changes, we must begin by saying thatcomets…
Astronomy
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