COVER A composite, false-color image of Jupiter's moon Io taken by the Galileo orbiter on 29 March 1998. Most of Io's brilliant colors are due to sulfur compounds, but the dark features are probably silicate lava flows, many of which are associated with deposits (red) from explosive volcanic eruptions. The circular plume deposit from the volcano Prometheus (right) is ~250 kilometers in diameter. [Image processing: P. Geissler]

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