NASA Cassini Image: Saturn's Titan and Icy Rhea

Saturn's largest and second largest moons, Titan and Rhea, appear to be stacked on top of each other in this true-colour scene from NASA's Cassini spacecraft released on Dec. 23, 2013.

The north polar hood can be seen on Titan appearing as a detached layer at the top of the moon on the top right. 

This view looks toward the Saturn-facing side of the smaller Rhea.

Credit: NASA