How does the refractory (rocky) nature of Io contrast with the formation implication of the slow model?
Answer
Its material might have passed through a region of intense heating for a long time before settling
The refractory nature of Io suggests its precursor material experienced prolonged, low-level heating or migration through warmer zones over millions of years before settling into its final orbit.
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Ch. 13: Jupiter (24 of 37) Formation of the Jupiter's Galilean Moons
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