Rhea is the second-largest moon of Saturn and the ninth largest moon in the Solar System. It was discovered in 1672 by Giovanni Domenico Cassini.
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.
16 Aug, 2013
by cnkguy with no comments yet.