Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 410
s-also of ten brighterand more sharply defined at one edge than at the other. The above description applies to comets which can boplainly seen by the naked eye. After astronomers beganto sweep the heavens carefully with telescopes, it wasfound that many comets came into sight which wouldentirely… … Fia. 101.—TELESCOPIC COMET WTrH- Fig. 102.—telescopic comet OUT A NUCLEUS. WITH A NUCLEUS. When comets are studied with a telescope, it ij foundthat they are subject to extraordinary changes of structure.To understand these changes, we must begin by saying thatcomets do not, like the planets,…
Astronomy
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