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NASA / JPL / SPACE SCIENCE INSTITUTE / UNIVERSITIES SPACE RESEARCH ASSOCIATION / LUNAR AND PLANETARY INSTITUTE / SCIENCE PHOTO LIBRARY NASA / JPL / SPACE SCIENCE INSTITUTE / UNIVERSITIES SPACE RESEARCH ASSOCIATION / LUNAR AND PLANETARY INSTITUTE / SCIENCE PHOTO LIBRARY
Surface of Rhea, Cassini image. Rhea, the second-largest of Saturn's moons, consists of about a quarter rock and three-quarters ice. Its surface is heavily cratered, with this view showing the the western half of Rhea's second-largest impact basin, Tirawa. This impact basin's rim is just left of centre. Now heavily cratered, it is thought Tirawa formed from the ancient impact of a comet. The two large craters (upper left, beyond the rim) are around 50 to 60 kilometres across. This image has been generated using stereo topography software to enhance and view data obtained in 2008 by the Cassini spacecraft that is in orbit around Saturn.
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