05 July 2002
Vol 297, Issue 5578

About The Cover

Cover image expansion

COVER The south polar region of Mars is highly enriched in hydrogen (blue) in the form of water ice buried less than a meter beneath the surface, as revealed by the Mars Odyssey Gamma-Ray Spectrometer measurements of gamma-ray and epithermal neutron flux. The topographic relief (exaggerated) is from the Mars Orbiter Laser Altimeter. Three reports in this issue focus on martian hydrogen distribution. See page 81 [Image: G. Shirah, Goddard Space Flight Center; W. Boynton and W. Feldman]