Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 56
s now generally believedthat this is a great ball of gas; in fact, an enormousbubble. The great pressure makes this gas denserthan water, so that it is not light and thin like the airaround us, but probably as thick as tar or jelly. Thisgas is no doubt composed of the vapors of the… … Fig. 13.—Sun-spots and Facul^:. (From Youngs The Sun.) number of dark spots. The shapes of these are veryvarious and irregular. The central part of a spot,called the nucleus, or umbra,1 is black, while around the 1 Umbra, Latin umbra, a shadow. 52 ASTRONOMY. edge is a lighter, grayish border, the…
Astronomy
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