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Composite image of Saturn and some of it's moons. The moons of the ringed planet are: Mimas (upper center), Enceladus (upper left), Tethys (far right), Dione (center), Rhea (center left), Titan (lower right) and Hyperion (foreground). Saturn is mostly comprised of hydrogen and helium gas, whilst it's moons are largely made of frozen water. The largest moon, Titan, has a diameter of about 5150 kilometers, making it larger than the planet Mercury. This image was made by combining Voyager 2 images of Saturn and it's moons with an artwork of the surface of Hyperion. (KEYSTONE/SCIENCE PHOTO LIBRARY/Str) === ===