Contents

19 March 2010
Vol 327, Issue 5972

About The Cover

Cover image expansion

COVER Saturn and its rings as seen by the Cassini orbiter. Saturn's rings contain innumerable chunks of water ice polluted by material of varying color and composition. The massive B ring (bottom) and the tenuous C ring (closest to the planet) are dominated by unexplained structure. Saturn's yellowish appearance signifies a deep cloud layer beneath seasonal haze. See pages 1470 and 1476. Image: NASA/JPL/CICLOPS