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Phobos' Largest Crater

This close-up of the largest crater on Phobos, Stickney, 10 kilometers (6 miles) in diameter, shows individual boulders near the rim of the crater. Some of these boulders are enormous - more than 50 meters (160 feet) across. Also crossing at and near the rim of Stickney are shallow, elongated depressions called grooves. This crater is nearly half the size of Phobos and these grooves may be fractures caused by its formation. This image of Phobos, the inner and larger of the two moons of Mars, was taken by the Mars Global Surveyor on August 19, 1998.

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