Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 154
If we take the view that Marshas an atmosphere like the Earth, but much less THE SOLAR SYSTEM 143 dense, containing water-vapour, these white capswould naturally be interpreted as snow. The rapiditywith which they disappear is sufficient proof that theycannot be thick masses of ice and snow such as… … Diag. LXVL—Mars. it be) at the south pole of Mars in the year 1894. Thefeatures we see in Mars were for a time supposed to beland and seas. We may be pretty confident from theabsence of clouds, and the. probable low temperatureof the planet, that the dark parts are not seas,but solid land of a…
Astronomy
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