Last updated on April 17, 2014 at 21:23 EDT
Southern Hemisphere Neutron Map
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Southern Hemisphere Neutron Map

October 7, 2009
Observations from NASA's 2001 Mars Odyssey produced this high-energy neutron detector map of martian neutrons in the southern hemisphere. The blue region around the south pole indicates a high content of hydrogen in the upper 2 to 3 meters (7 to 10 feet) of the surface.

The neutrons were measured by the medium detector (in counts per second) during the first week of mapping, in February 2002. The space background neutrons have been subtracted. The pixels are 10 by 10 degrees.