Volcanoes of Io
After the detailed imaging of Io, the fourth-largest moon in the Solar System, in 1979 by Voyager 1, it was concluded that Io is the most geologically active body in the solar system. It also has the lowest amount of water of any object in the solar system. Discovered by Galileo, the moon has more than 400 active volcanoes. The moon has mountain peaks taller than Mount Everest and its surface is mainly made up of iron and sulphur. Imagine mountains taller than Everest full of sulphur and iron oxides! These volcanoes are responsible for large clouds of gases around Jupiter. It is one of the only four volcanic active bodies in the solar system after Earth, Enceladus and Triton. Voyager 1 during its close flyby of Io experienced the strong tidal heating from the volcanoes. Also, the gravity of Jupiter changes the amount and direction of tidal heating. Lavas on Io are hundreds of kilometres long and are different from those on Earth. Lava on Earth is mainly made up of iron and magnesium,