Rhea, discovered on December 23, 1672 by Giovanni Cassini, is the second largest moon of Saturn, but at a distance of 527,000 kilometers from Saturn and with a mean radius of 764 kilometers it is less than a third of the moon’s radius plus big of Saturn, Titan. Rhea is a small, cold, airless body that is very similar to sister moons Dione and Tethys.
In 2008, the Cassini spacecraft found evidence of material orbiting Rhea, the first time rings were found around a moon. A wide disk of debris and at least one ring appear to have been detected by a suite of six instruments at Cassini specifically designed to study the atmospheres and particles around Saturn and its moons.
The bright lightning crater about 40 kilometers wide is located on the right side of this mosaic (12 degrees south latitude, 111 degrees west longitude).
Rhea is also known as Saturn V, which denotes the fifth moon in distance from Saturn.