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Ganymede

  • Largest of the Galilean moons
  • Made of ice
  • Has a great deal of cratering
  • 14\frac{1}{4} of the surface seems old (heavily cratered) and the rest formed more recently
  • Has differentiated like the terrestrial planets
  • Has a magnetic field
    • Signature of a partially molten interior
  • Tidal forces from Jupiter have probably helped heat its interior and trigger major convulsions on its crust

Moon Jupiter