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Named
after the cup-bearer to the Greek gods on Mt Olympus, Ganymede is
the largest moon in our solar system. At 3,280 miles in diameter,
it's over one and a half times the size of our moon, even larger
than the planet Mercury.
The
recent discovery of a magnetosphere around Ganymede indicates the
moon has a metallic core of iron or iron alloy. On top of the core
lies a mantle of ice and silicates.
The
surface crust of Ganymede is composed of a thick layer of water
ice.

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