Quote:
Originally posted by Tony Shepps
All I know is that Io is about the same size as Earth's own moon, and that it's the most volcanic item in the solar system, which is weird considering that it's in the middle of nowhere. Shouldn't it have cooled down by now?
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It's not in the middle of nowhere, it's near Jupiter, the second most happening place in the system (next to the Sun). IIRC, tidal forces from Jupiter's gravity are supposed to drive Io's vulcanism.