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Hence, unlike the other Galilean moons, charged-particle irradiation has had a relatively minor effect on Callisto's surface.The exact composition of Callisto's rock component is not known, but is probably close to the composition of L/LL type ordinary chondrites, which are characterized by less total iron, less metallic iron and more iron oxide than H chondrites.Failing an ocean, the icy lithosphere may be somewhat thicker, up to about 300 km.Beneath the lithosphere and putative ocean, Callisto's interior appears to be neither entirely uniform nor particularly variable.It is less affected by Jupiter's magnetosphere than the other inner satellites because of its more remote orbit, located just outside Jupiter's main radiation belt.It does not show any signatures of subsurface processes such as plate tectonics or volcanism, with no signs that geological activity in general has ever occurred, and is thought to have evolved predominantly under the influence of impacts.
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Small, bright patches of pure water ice are intermixed with patches of a rock–ice mixture and extended dark areas made of a non-ice material.
It was found that Callisto responds to Jupiter's varying background magnetic field like a perfectly conducting sphere; that is, the field cannot penetrate inside Callisto, suggesting a layer of highly conductive fluid within it with a thickness of at least 10 km.
Callisto's anti-Jovian hemisphere imaged in 2001 by NASA's Galileo spacecraft. The large impact structure Asgard is on the limb at upper right.
The prominent rayed crater below and just right of center is Bran.