Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 324
owingnotable temporary changes in its appearance. 172. The Polar Caps and the Temperature of Mars. —The surface of Mars on the whole is dull brick-red in color,but its polar regions during their winter seasons are coveredwith snow-white mantles. One of these so-called polarcaps sometimes develops… … 278 AN INTRODUCTION TO ASTRONOMY [ch. ix, 172 diminishes in size, contracting first around the edges; itthen breaks up more or less, and it sometimes entirely dis-appears in the late summer. After the southern polar cap has shrunk to the dimensionsgiven by Barnards observation of August 13, 1894,…
Astronomy
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
