What significant issue arising from rapid, *in situ* formation under the classic model is cited as a major hurdle?
Answer
Significant gas drag causing rapid orbital migration and potential consumption by Jupiter
If the moons formed quickly from a dense, gas-rich disk, the intense gas drag should have caused them to migrate inward and potentially spiral into Jupiter.
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Ch. 13: Jupiter (24 of 37) Formation of the Jupiter's Galilean Moons
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