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12 years ago
Contrast the densities and compositions of the four Galilean moons. 
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12 years ago
Closer to Jupiter and dried out by its tides and radiation, Io and Europa are about as dense as our own Moon and made chiefly of rock.  But larger Ganymede and Callisto are less stressed, less dense, and have extensive mantles of water and ice above their rock cores. 
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