Advanced Physiography

Cover Advanced Physiography
Advanced Physiography
Gregory, Richard, Sir, 1864-1952
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80.) We know the sun to be at a high temperature and self luminous ; the surface of the earth is cool, but the temperature increases as we go. down, showing that a high temperature exists in the interior of our globe ; our satellite, however, seems to be a cold dead body* . There is little Digitized by Google THE SUN AND MOON. 157 doubt that the moon, earth and sun at one time were all at the same temperature. The sun as it cooled threw off the earth, and the earth similarly threw off the moon.... The three bodies are illustrations of the ordinary law of cooling ; and for the same J Fig. 80. General appearance of the Moon in a small telescope.
The top of the picture is the south.
reason that a large hot object takes much longer to*cool than a small one, we find the temperature of that enormous mass, the sun, considerably higher than that of the earth, and the tempera- ture of the earth much higher than that of its smaller companion the moon.
Digitized by Google 158 ADVANCED PHYSIOGRAPHY.


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