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Ganymede
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Ganymede has craters
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Bright and dark terrain
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opposite of moon
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dark older
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bright newer
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Bright terrain has groves
similar to Europa, but no rafts
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Ganymede has a magnetic field!
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indicates warm liquid metal
interior
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heat not from current tidal
forces
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may have previously had a
eccentric orbit
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tidally heated at perijove
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orbit circularized by other
moons
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still warm inside
Dark terrain
Bright terrain
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