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Photos of the Week

21 of 50

Mars McLaughlin Crater

This image provided by NASA shows the layered rocks on the floor of the McLaughlin Crater on Mars taken Sunday Jan. 20, 2013 showing sedimentary rocks, on right, that contain spectroscopic evidence for minerals formed through interaction with water according to scientists. The scene covers an area about one-third of a mile (about 550 meters) across. It was takne by The High Resolution Imaging Science Experiment camera on NASA's Mars Reconnaissance Orbiter. (AP Photo/NASA)

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