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Rhea moon

This artist's conception provided by NASA shows the ring of debris that may orbit Saturn's second-largest moon, Rhea, shown at left. These new observations, detected by the Cassini spacecraft suggest Saturn's second-largest moon may be surrounded by rings, possibly the first time a ring system has been found around a moon. (AP Photo/NASA/JPL/JHUAPL)

Saturn's moon comes into sharper focus

The pockmarked surface of Saturn's second-largest moon has come into sharper focus in new images released by NASA.