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But many facts are opposed to this idea, among others that the polar snows appear always of the purest white, although the rays of light derived from them traverse twice the atmosphere of Mars under great obliquity. We must then conclude that the Arean continents appear red and yellow because they are so in fact.
When this conclusion is assured beyond all doubt another one may be derived from it of not less importance that the temperature of the Arean climate notwithstanding the greater distance of that planet from the sun, is of the same order as the temperature of the terrestrial one. The elements of the meteorology of Mars seem, then, to have a close analogy to those of the earth.
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