No one has yet found absolute proof that there is life on Mars. But impressive evidence has been mounting for years. Among the red areas that give the red planet its name, astronomers can see darker patches that change and fade through the Martian year in a manner that strongly suggests the seasonal growth of vegetation. When the thin icecaps at the planet's poles disappear with the coming of the Martian spring, belts of darker color creep toward the equator, sometimes crossing it. This effect might be caused by some nonliving chemical...
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