Saturn’s moon Rhea [REE-a] is an icy body with a rocky core taking up less than one-third of the moon's mass, with the rest composed of water-ice. Rhea is somewhat similar to Dione. Rhea is heavily cratered with bright whispy markings.

This color-enhanced image was taken by the Cassini spacecraft.

Rhea’s cratered surface was already ancient before any complex life developed on Earth. The terrain seen here has probably changed little in the past billion years.

Image by the Cassini spacecraft.

Cassini captured this closeup of Rhea’s cratered surface.

The edge of a very bright crater on Rhea that seems more recent than the rest.

Image by the Cassini spacecraft.