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]

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