Ganymede is the only moon with its own magnetic field
Ganymede, Jupiter's largest moon, is the only moon known to generate its own magnetic field, hinting at a molten core and potential for life in its subsurface ocean.
Jupiter's moon Ganymede, larger than Mercury, uniquely generates its own magnetic field. This remarkable feature, first detected by Voyager 1 and confirmed by Galileo, suggests a molten iron-nickel core, much like Earth's. This internal dynamo hints at a surprisingly active interior beneath its icy crust and vast subsurface ocean.
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