Io
Io is the innermost of the four Galilean moons of Jupiter and the fourth-largest moon in the solar system. It is known for its volcanic activity, with over 400 active volcanoes, making it the most geologically active object in the solar system. Io's surface is constantly changing due to the volcanic activity, which also contributes to the formation of a thin atmosphere composed mainly of sulfur dioxide. Io's interaction with Jupiter's magnetic field also results in intense radiation belts and auroras around the moon. The study of Io provides valuable insights into the geology and dynamics of the Jovian system.
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