For 10 points, name this moon of Jupiter, the largest satellite in the solar system.
Two large crater impact basins on this entity are named for Isis and Gilgamesh, and the hypothesis that this entity contains a subterranean saltwater ocean is supported by the light-colored terrain of the Arbela Sulcus. Having a mantle largely composed of ice, one can find the Memphis Facula inside this entity's largest plain, the Galileo Regio, and this entity is the only known satellite in the solar system with its own magnetosphere. This moon's orbit forms a Laplace resonance with those of Io and Europa, and Voyager 2 revealed that it is actually larger than Titan. For 10 points, name this moon of Jupiter, the largest satellite in the solar system.
Two large crater impact basins on this entity are named for Isis and Gilgamesh, and the hypothesis that this entity contains a subterranean saltwater ocean is supported by the light-colored terrain of the Arbela Sulcus.
{Ganymede}