COVER Color mosaic of Culann Patera, an active volcano on Jupiter's moon Io, taken by NASA's Galileo spacecraft on 26 November 1999. A central caldera (green) feeds radial lava flows, including dark active flows (bottom left). Diffuse red material condenses from sulfur-rich gas erupting from the volcano. The scene width is 227 kilometers, at a scale of 200 meters per pixel; north is to the left. A collection of reports on Io begins on p. 1193 [Image processing: C. Phillips, University of Arizona, Tucson]

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