A detail of an image captured by NASA's Curiosity Mars rover shows exposed layers of mudstone and sandstone in contact with one another. NASA/JPL-Caltech/MSSS hide caption

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A photo composed of nearly 900 images taken by the rover Curiosity shows a section of Gale Crater near the equator of Mars. The rovers are continuing to work through the U.S. government shutdown. NASA/AP hide caption

toggle caption NASA/AP