Io is the innermost Galilean moons of Jupiter. Out of all the moons in the solar system it has the highest density. Io is the most volcanically active body in the solar system with hundreds of active volcanoes.
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IO Io is the innermost Galilean moons of Jupiter. Out of all the moons in the solar system it has the highest density. Io is the most volcanically active body in the solar system with hundreds of active volcanoes.