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April 19, 2007
This mosaic is from from NSA's image of the day. Io is the most volcanically active body in the solar system, with volcanoes that erupt massive volumes of silicate lava, sulphur and sulphur dioxide, constantly changing Io's appearance.

Tammy Becker and Paul Geissler, NASA, Io
This basemap of Jupiter's moon Io was produced by combining the best images of the Voyager 1 and Galileo missions.
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