Saturn's smallest spherical moon is thought to be composed largely of ice.
Though it is only 250 miles (400km) in diameter, Mimas has a huge 80-mile-wide (130km) impact crater called Herschel, which is named after the moon's discoverer, astronomer William Herschel. Some say this large crater makes Mimas look a bit like the Death Star in the Star Wars films.
Photo: Mimas taken by the Cassini probe (NASA/JPL/Space Science Institute)
Voyager 2 showed the world Saturn's intricate rings up-close for the first time. Strange features like shepherd moons and spokes gave researchers plenty to think about. The Voyager probes were launched in 1977.
Sir Patrick Moore looks at Cassini-Huygens's first images of some of Saturn's moons.
Sir Patrick Moore has a look at the Cassini-Huygens probe's first images of some of Saturn's icy moons - Phoebe, Mimas, Tethys and Iapetus - and discusses the mission with his guests.
Mimas is a moon of Saturn which was discovered in 1789 by William Herschel. It is named after Mimas, a son of Gaia in Greek mythology, and is also designated Saturn I.
With a diameter of 396 kilometres (246 mi) it is the twentieth-largest moon in the Solar System and is the smallest known astronomical body that is rounded in shape due to self-gravitation.
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