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    Io. The most volcanically active body in the Solar System, it's about the same size as the Moon and orbits at about the same distance from Jupiter as the Moon does from Earth. Yet it has over 400 volcanoes and a “month” on Io lasts only 42 hours. This is all down to gravity. Caught between Jupiter's strong gravity and that of its companions Callisto & Ganymede, Io is mercilessly squeezed, releasing heat. ©Mona Evans,"Jupiter's Galilean Moons" www.bellaonline.c...

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