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}}'''Callisto''' is the outermost of the [[Galilean moons]] of Jupiter, and the second-largest moon of that primary and the third-largest natural [[satellite]] in all the [[solar system]] after [[Ganymede]] and [[Titan (moon)|Titan]]. Once considered a boring, undifferentiated lump of rock, Callisto has surprised planetary scientists at least as much as has other moons like Titan or Ganymede or [[Europa]] after the kind of close-up observation that deep-space orbiters can provide.

}}'''Callisto''' is the outermost of the [[Galilean moons]] of Jupiter, and the second-largest moon of that primary and the third-largest natural [[satellite]] in all the [[solar system]] after [[Ganymede]] and [[Titan (moon)|Titan]]. Once considered a boring, undifferentiated lump of rock, Callisto has surprised planetary scientists at least as much as has other moons like Titan or Ganymede or [[Europa (moon)|Europa]] after the kind of close-up observation that deep-space orbiters can provide.

== Discovery and naming ==

== Discovery and naming ==