This is an image of Jupiter's moon, Io, that was taken in July, 1999. The Galileo spacecraft took this picture during its orbit of Jupiter from 1995 to 2003. It is the strangest moon in the solar system due to its bright yellow color, which is the result of sulfur and molten silicate rock. The surface is covered with active volcanoes created by friction from Jupiter's other Galilean moons. Some of the lava is so hot that is glows in the dark!!
http://apod.nasa.gov/apod/ap101003.html
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