📁 Callisto
Callisto is the 8th moon out from Jupiter and is the second largest moon of Jupiter. Callisto is covered with craters, but there appears to be something resurfacing small craters. Callisto is believed to have a water ice ocean much like Europa, except under a thicker outer shell.
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Eric Weisstein's World of Astronomy: Asteroids
http://scienceworld.wolfram.com/astronomy/topics/Asteroids.html