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Io - Solarballs
Io is one of Jupiter's moons, and it's a fascinating place. It's the most volcanically active object in the solar system, with over 400 active volcanoes! The reason for this is because Io is caught in a gravitational tug-of-war between Jupiter and two other moons, Europa and Ganymede. This causes massive tidal forces that heat up Io's interior, leading to all the volcanic activity.