Jupiter has over 79 known moons, with the four largest being the Galilean moons: Io, Europa, Ganymede, and Callisto. Each of these moons has distinct surface features: ### 1. **Io** - **Volcanic Activity:** Io is the most geologically active body in the solar system, with hundreds of active volcanoes and lava flows. Its surface is dominated by sulfur and sulfur dioxide, giving it a colorful appearance.
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