Saturn's Moons Titan and Dione from Cassini
http://apod.nasa.gov/apod/ap100420.html
Saturn has 62 moons with confirmed orbits. This is a picture, taken by the Cassini spacecraft, of Titan and Dione. Titan is Saturn's largest moon; it is larger in volume than Mercury. It has an atmosphere and its surface is obscured by clouds. Both Titan and Dione are composed of water ice and rocky material. In the picture, both moon are in the gibbous phase because they are close to each other. The Cassini-Huygens spacecraft was launched in 1997 and entered into orbit around Saturn in 2004. The Huygens probe landed on Titan in 2005.
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