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Unformatted text preview: thicker, up to about 300 km. Beneath the lithosphere and putative ocean, Callisto's interior appears to be neither entirely uniform nor particularly variable. Galileo orbiter data  (especially the dimensionless moment of inertia [h] 0.3549 0.0042determined during close flybys) suggest that its interior is composed of compressed rocks and ices , with the amount of rock increasing with depth due to partial settling of its constituents.   In other words, Callisto is only partially differentiated . The density and moment of inertia are compatible with the existence of a small silicate core in the center of the satellite. The radius of any such core cannot exceed 600 km, and the density may lie between 3.1 and 3.6 g/cm 3 .   Callisto's interior is in stark contrast to that of Ganymede , which appears to be fully differentiated....
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- Fall '10