Which moon is the only magnetic one in our solar system?

Tabby Tom

From www.caalley.com/diduno.html What is the only magnetic moon in the Solar System? The largest planetary satellite in the Solar System is also the only moon known to have a substantial magnetic field. When the Galileo spacecraft first approached Jupiter's moon Ganymede, it recorded bursts of radio noise and magnetism that revealed a teardrop-shaped magnetosphere, just like Jupiter's. Ganymede's magnetic field is embedded in the much vaster magnetic field of Jupiter, which in turn is embedded in the enormous magnetic bubble carved by the Sun from the galactic field. Earth's magnetic field is embedded in the same bubble. It is not clear how Ganymede can generate a magnetic field. To do so, it must contain an inner core or layer that conducts electricity. Is its core made of metal? Is there a layer of salty water above the core? Future exploratory missions may help settle the mystery. Oct 30 01, 11:32 AM

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