Io

Io is a moon of Jupiter that is literally covered in volcanoes. It is 3,642 km in diameter. It has over 400 active volcanoes! Io's worst eruptions can spew sulphur 323 km high! When that goes down, it creates lava lakes 200 km in diameter. The surface of Io with no volcanoes is -130 degrees Celcius. But the volcanoes heat up to 1,649 degrees Celcius.