Contents

12 April 1991
Vol 252, Issue 5003

About The Cover

Magellan radar image of Alpha Regio (25°S, 4°E), an upland ˜1300 kilometers across and the first feature on Venus identified from Earth-based radar. The bright area contains ridges, troughs, and valleys that intersect to form a polygonal pattern. Dark patches are low areas filled with lava. To the south is Eve, a large ovoid volcano-tectonic feature. Lava flows emanating from Eve embay the ridged terrain. See news page 213 and reports pages 247 to 312. [Image by Eric DeJong and Myche McAuley, Jet Propulsion Laboratory Multimission Image Processing Laboratory]