COVER Morning shadows darken Gusev crater, landing site of the Spirit rover, in this computer-assisted rendering of the ancient martian surface, based on topographic data from the Mars Orbiter Laser Altimeter onboard the Mars Global Surveyor. Discoveries by Spirit, its companion rover Opportunity, and the Surveyor spacecraft confirmed that some areas of Mars were once covered by shallow water and thus could have supported life. See the Breakthrough of the Year special section and the accompanying Editorial. [Image: Kees Veenenboss]

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