Galileo orbited Jupiter for virtually 8 years, and made close passes by all its significant moons. They found that the giant moon Ganymede possesses its own magnetic field. Galileo even carried a small probe that it released and sent deep into the ambience of Jupiter, taking readings for practically a hr before the probe was squashed by frustrating pressure. Galileo magnetic information provide evidence that the moons Ganymede and Callisto also likely have a liquid saltwater layer. Galileo discovered the first moon around a planet, little Dactyl orbits the asteroid Ida. Ganymede is the first moon known to possess an electromagnetic field. Galileo's climatic probe discovered that Jupiter has thunderstorms many times bigger than Earth's. Io's comprehensive volcanic activity might be 100 times greater than that found in the world. Io's complex plasma interactions in Io's environment consist of support for currents and coupling to Jupiter's ambience.
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