Rhea ("REE a") is the fourteenth of Saturn's known satellites and the second largest:
In Greek mythology Rhea was the sister and wife of Cronus (Saturn) and the mother of Demeter, Hades (Pluto), Hera, Hestia, Poseidon (Neptune), and Zeus (Jupiter).
Discovered by Cassini in 1672.
Though somewhat larger, Rhea is otherwise very similar to Dione. They both have similar compositions, albedo features and varied terrain. Both rotate synchronously and have dissimilar leading and trailing hemispheres.
Rhea is composed primarily of water ice with rock making up less than 1/3 of its mass.
Rhea's history is probably very similar to Dione's.
More about Rhea
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Bill Arnett; last updated: 2005 May 14