This photo made March 10, 2012, by NASA's Cassini spacecraft shows a raw, unprocessed image of Saturn's moon Rhea. The camera was pointing toward Rhea from a distance of approximately 42,096 kilometers (26,157 miles). (AP Photo/NASA/JPL-Caltech/SSI)
The pockmarked surface of Saturn's second-largest moon has come into sharper focus in new images released by NASA.