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Formation
Theories of Jupiter's Moons
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Jupiter's moons formed at
the same time as Jupiter
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Analogous to planets forming
around the Sun
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large cloud
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dense concentration in center
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disk
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clumps in disk
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Lots of water ice at Jupiter's
cloud
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Different densities of moons
suggest Jupiter's internal heat played a role
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Close moons had water evaporated
away
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Tidal heating allowed
chemical differentiation
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Io, Europa (close moons)
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denser
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active surfaces (caused by
warm interiors)
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Ganymede, Callisto
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less dense, less active
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Callisto not even differentiated
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Jupiter even has equivalent
of asteroid belt
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inner small moons Amalthea,
Adrastea, Metis, ...
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ring of rock dust (each particle
<1mm)
Chemical differentiation
in the Earth
Jupiter's dust ring in
the infrared (also note belts and zones)
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