Issue Date: December 1, 2008
Mars's Watery Mysteries
EVIDENCE IS ABUNDANT that water once flowed on Mars, from widespread deep trenches and gullies carved by great outpourings to the water-linked sediments and minerals impregnating the planet's surface.
In fact, there still is a large quantity of water on Mars. It's there in the polar ice caps and in a planetary blanket of permafrost. And as scientists have just discovered, it's also present in the form of dust-covered glaciers at Mars's mid-latitudes.
But the . . .
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