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Home Curiosity, the big rover of NASA’s Mars Science Laboratory mission, will land in August 2012 near the foot of a mountain inside Gale Crater. (NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS) Curiosity, the big rover of NASA's Mars Science Laboratory mission, will land in August 2012 near the foot of a mountain inside Gale Crater. (NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS)

Curiosity, the big rover of NASA’s Mars Science Laboratory mission, will land in August 2012 near the foot of a mountain inside Gale Crater. (NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS)

Curiosity, the big rover of NASA's Mars Science Laboratory mission, will land in August 2012 near the foot of a mountain inside Gale Crater. (NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS)

Curiosity, the big rover of NASA’s Mars Science Laboratory mission, will land in August 2012 near the foot of a mountain inside Gale Crater. (NASA/JPL-Caltech/ESA/DLR/FU Berlin/MSSS)

This evenly layered rock photographed by the Mast Camera (Mastcam) on NASA’s Curiosity Mars Rover on Aug. 7, 2014, shows a pattern typical of a lake-floor sedimentary deposit not far from where flowing water entered a lake. (NASA/JPL-Caltech/MSSS)
This view from the Mastcam on NASA’s Curiosity Mars rover shows an example of cross-bedding that results from water passing over a loose bed of sediment. (NASA/JPL-Caltech/MSSS)