A painting of Jupiter’s moon IO
IO is the most volcanically active world in the solar system: It has hundreds of volcanoes, including some that erupt lava fountains that are dozens of miles high
Inspired by BBC series Solar System by Professor Brian Cox Image reference from NASA
Note. Jupiter is in the background. The whiteish moon is Europa, together with Ganymede and Jupiter they produce massive gravitational forces on IO resulting in tidal heating