Ganymede is the only moon known to have its own magnetic field. Its magnetic field causes auroras (ribbons of glowing, hot, electrified gas) in the regions around the north and south poles of the moon.
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Ganymede is the only moon known to have its own magnetic field. Its magnetic field causes auroras (ribbons of glowing, hot, electrified gas) in the regions around the north and south poles of the moon.