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Fig. 6.42. A Galileo spacecraft image revealing large landslide deposits within two large impact craters. The two landslides are about 3 km in length and occurred when material in the crater walls failed under gravity. These deposits are interesting because they traveled several kilometers from the crater wall in the absence of an atmosphere or other fluids that might have lubricated the flow. (Credit: NASA/JPL/Arizona State University)

Fig. 6.42. A Galileo spacecraft image revealing large landslide deposits within two large impact craters. The two landslides are about 3 km in length and occurred when material in the crater walls failed under gravity. These deposits are interesting because they traveled several kilometers from the crater wall in the absence of an atmosphere or other fluids that might have lubricated the flow. (Credit: NASA/JPL/Arizona State University)

ice-free core made up of a mixture of rock material and iron sulfide alloy [465]. Callisto does not display any non-impact related tectonic features [466].

So, of the four Galilean moons, Callisto has the oldest undisturbed surface and is the most stable. It may have a subsurface ocean that still exists today. And, unlike the other Galilean moons, it shows no sign of any kind of volcanism.

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