Why does Callisto likely possess a less differentiated interior compared to Ganymede?
Answer
Radioactive heating materials decayed before Callisto accreted its majority mass.
Callisto started accreting significantly later than Ganymede; by the time Callisto gathered most of its mass, much of the heat-generating radioactive aluminum isotope had decayed away in the surrounding disk material, resulting in a cooler, less differentiated interior.
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