Titan and Rhea, Cassini Image obtained on June 16, 2011

Two largest moons of Saturn, Titan (1st) and Rhea (2nd) appear to be stacked on top of each other in this true-color scene. This view was obtained on June 16, 2011 at a distance of approximately 1.1 million miles (1.8 million kilometers) from Rhea and 1.5 million miles (2.5 million kilometers) from Titan and looks toward the Saturn-facing side of Rhea.

Rhea is the second-largest moon of Saturn (949 miles or 1528 kilometers across) and the ninth-largest moon in the Solar System. It is also the second smallest body in the Solar System which precise measurements have confirmed a shape consistent with hydrostatic equilibriumNotes 3 (the smallest is the asteroid and dwarf planet Ceres, the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter, which has a diameter of approximately 587 miles / 945 kilometers).

Rhea was discovered by Giovanni Domenico Cassini on 23 December 1672. Image source: NASA

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