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Jupiter and Io. "The image shows a major eruption in progress on Io's night side, at the northern volcano Tvashtar. Incandescent lava glows red beneath a high volcanic plume, whose uppermost portions are illuminated by sunlight. The plume appears blue due to scattering of light by small particles in the plume."
Jupiter and Its Moons Photograph courtesy NASA This family portrait, a composite of the Jovian system, includes the edge of Jupiter (with the Great Red Spot visible) and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom are Io, Europa, Ganymede, and Callisto. The smallest of these four moons, Europa is about the size of Earth's moon.
Based on new evidence from Jupiters moon Europa, astronomers hypothesize that chloride salts bubble up from the icy moons global liquid ocean and reach the frozen surface where they are bombarded with sulfur from volcanoes on Jupiters moon Io. credit : NASA/JPL-CalTech
Io, one of Jupiter's many moons and larger than our own. With over 400 active volcanoes, Io is the most geologically active object in the Solar System. This extreme geologic activity is the result of tidal heating from friction generated within Io's interior as it is pulled between Jupiter and its moons Europa, Ganymede and Callisto. Several volcanoes produce plumes that climb as high as 300 miles above the surface. Io has more than 100 mountains, some of which are taller than Mount Everest.