19 May 2000
Vol 288, Issue 5469

About The Cover

Cover image expansion

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]