Rhea is Saturn’s second largest moon with a diameter of 1528 kilometres. Rhea’s surface is covered with impact craters. The large crater at upper right is named Tirawa. The Cassini-Huygens spacecraft was launched in 1997 to investigate Saturn, its rings and its moons. Images obtained by the Cassini spacecraft’s narrow-angle camera on 26th November 2005. (Photo by Science Photo Library)
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