An anonymous reader writes "More than 400 years after Galileo's discovery of Io, the innermost of Jupiter's largest moons, a team of scientists led by Arizona State University has produced the first complete global geologic map of the Jovian satellite. The map, published by the U. S. Geological Survey (PDF), depicts the characteristics and relative ages of some of the most geologically unique and active volcanoes and lava flows ever documented in the Solar System."
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