Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 194
; but at the terminator, orboundary between day and night upon the planets surface,there is a slight shading, which, taken in connection with cer-tain other phenomena, indicates the presence of an atmosphere.This atmosphere, however, is probably much less dense thanthat at the earth, as indicated… … Fig. 52. 184 MARS. [§253 vations of Campbell at the Lick Observatory do not confirmthis, and go to show that whatever atmosphere exists must bevery rare indeed, probably not more than one-fourth as denseas our own. Zollner gives the albedo of Mars as 0.26, just double that ofMercury, and much…
Astronomy
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