What feature on Jupiter's moon Ganymede strongly suggests it harbors a molten, electrically conducting layer?
Answer
Possession of its own intrinsic magnetic field
Ganymede, recognized as the largest moon in the Solar System, possesses its own intrinsic magnetic field. This magnetic field is a strong piece of evidence suggesting that the moon must still maintain a molten, electrically conducting layer deep inside its interior. This suggests ongoing internal differentiation or at least activity that occurred relatively recently in geological terms, distinguishing it from worlds that have completely cooled.
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