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Cover: Main image—Sunlight on an icy martian crater, an image from the Mars Express spacecraft showing a pocket of water ice in a martian crater. Source—ESA/DLR/Freie Universitaet Berlin (G. Neukum). Reprinted by permission from Macmillan Publishers Ltd., “Snapshot: Sunlight on an Icy Martian Crater,” Nature 435:9, June 9, 2005. Copyright 2005. Additional images—Artist’s impressions of (top to bottom) the Mars Reconnaissance Orbiter, a Mars lander under parachute, and the proposed Mars Deep Driller. Courtesy of NASA/JPL.

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