Why did Callisto's formation timeline significantly diverge from the inner moons, resulting in a much longer accumulation time?
Answer
The Sun's intensifying radiation likely evaporated much of the gas in Jupiter’s disk by the time Callisto coalesced significantly
By the time Callisto began substantial coalescence, the warming Sun likely evaporated much of the gas in the CJD, drastically slowing its accumulation process compared to the rapid formation of Io and Europa.
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