Io South Pole Grid
Io is the most volcanically active body in the solar system. Volcanoes erupt massive volumes of silicate lava, sulphur and sulphur dioxide, constantly changing Io's appearance. This new basemap of Jupiter's moon Io was produced by combining the best images from both the Voyager 1 and Galileo Missions.
Source: U.S. Geological Survey
Credit: United States Geological Survey