+Io is a celestial body, the innermost of the four Galilean moons orbiting [Jupiter](/wiki/jupiter). It is renowned for its extreme [Volcano](/wiki/volcano) activity, making it the most geologically active world in our solar system.
+## See also
+- [Europa](/wiki/europa)
+- [Ganymede](/wiki/ganymede)
+- [Callisto](/wiki/callisto)
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