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Saturn's Hyperion: A Moon with Odd Craters Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA What lies at the bottom of Hyperion's strange craters? Nobody's sure. To help find out, the robot Cassini spacecraft now orbiting Saturn swooped past the sponge-textured moon in 2005 and 2010 and took images of unprecedented detail. An image from the 2005 pass, shown above in false color, shows a remarkable world strewn with strange craters and a generally odd surface...
Mosaics of Jupiter's Moons - left to right, Ganymede, Europa, Callisto, & Io. The moons are known as Galilean satellites.
An image of Jupiter's moon Callisto showing a large impact basin, 2,600 km (1,600 mi.) across, on the moon's surface. Known as Valhalla, this is the largest impact crater yet discovered in the Solar System.