A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 518
The so-called whirlpool nebula in the constellation Canes Venatici is the moststriking specimen. This spiral structure, however, is to be made outonly in large telescopes ; in fact, very little of the real beauty of mostof these objects is accessible to instruments of less than 12 inchesaperture.… … Fig. 231. — The Annular Nebula in Lyra. 506 THE NEBULAE. is entirely invisible even with large ones,city has been ascertained in such cases. So far no regular periodi- 890. Their Spectra. — One of the earliest and most remarkableachievements of the spectroscope was its demonstration of the factthat…
Astronomy
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