The Solar System Six Lectures Delivered At the Massachusetts Institute of Techn
The Solar System Six Lectures Delivered At the Massachusetts Institute of Techn
Lowell Percival
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Lack of atmos- criterion. Phere alone prevents vegetation, and this, coupled with unalterableness of face presented to the Sun, weathers the surface to a neutral gray. Such a 48 The Solar System body shows but the bleached bones of a once living world. Now color is conspicuously wanting on Mer- cury. The disk of the planet is a chiaroscuro of black and white, tones devoid of tints. Mars a life- Mars is an opal. Colors comparable only to wor?d. R " that stone variegate its disk. At top and botto...m, collars of pearl-white contrast vividly with light areas of rose-saffron and darker ones of robin's-egg blue. Daylight reveals these colors much better than night, because the contrast of the blue-black sky clothes the disk with yellow it does not really possess, diluting the true tints. Mars has The markings enable the rotation of the planet to be found - The markings move under the ob- server's eye and yet keep their relative configura- tions the same, day after day and year after year. They thus reveal the fact that the planet rotates, and by the course of their motion disclose the axis about which the rotation takes place.
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