NASA's Mars Reconnaissance Orbiter used its High Resolution Imaging Science Experiment (HiRISE) camera to take the sharpest images ever of the Martian moon Phobos. This image, taken about 4,200 miles from the moon, shows an area of about 13 miles wide. The most prominent feature on the moon is the Stickney crater (right) which is about 5.6 miles in diameter. Scientists believe that the bluish area on the edge of the Stickney crater indicates a younger area of the moon.
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