Erupting Volcanoes on Io . ... Credit Copyright: Voyager Project , JPL , and NASA Explanation: Jupiter's moon Io has active volcanoes. ... In the above picture, several of Io's volcanoes are visible and one is seen actually erupting. ... These tides stretch Io , cause internal friction, and thus heat the interior. The hot interior then expands and forces its way out through volcanoes. Currently, the spacecraft Galileo is orbiting Jupiter and photographing Jupiter's Galilean moons . ...