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Jupiter Moon Melted By Asteroid, Comet Bombardment

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The remaining moon, Ganymede, was a bit of a mystery. Like Callisto, it appears to be a mixture of rock and water with a big difference: on Ganymede, the water appears to have melted, allowing the rock to sink to the core, and then froze up again.

Two scientists from the Southwest Research Institute now think they know why: Ganymede was hit so hard by asteroids and comets during the solar system's early history that it underwent runaway melting.

Read the whole story at Ars Technica

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