Rhea is one of the moons of Saturn and is its second-largest satellite, after Titan. Discovered in 1672 by the astronomer Giovanni Domenico Cassini, Rhea is notable for its size, being the ninth-largest moon in the Solar System. It has a diameter of about 1,527 kilometers (approximately 949 miles). Rhea is primarily composed of ice and rock, and its surface is heavily cratered, indicating a long history of impacts.
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