Submitted by AutoModerator t3_11f5wzd in askscience
Weed_O_Whirler t1_jajy1tc wrote
Reply to comment by Orisose in Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science by AutoModerator
Magnetic fields in planets/moons is caused by having a rotating, magnetic core, which Ganymede does. The size does not matter.
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