Water in Mars' subsurface from Mars Odyssey's Neutron Spectrometer (epithermal neutrons)
![Water in Mars' subsurface from Mars Odyssey's Neutron Spectrometer (epithermal neutrons)](https://planetary.s3.amazonaws.com/web/assets/pictures/_2400x1233_crop_center-center_82_line/20140212_PIA03800.jpg 2400w, https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x616_crop_center-center_82_line/20140212_PIA03800.jpg 1200w, https://planetary.s3.amazonaws.com/web/assets/pictures/_768x394_crop_center-center_60_line/20140212_PIA03800.jpg 768w, https://planetary.s3.amazonaws.com/web/assets/pictures/_576x295_crop_center-center_60_line/20140212_PIA03800.jpg 576w)
The view shown here is a map of measurements made during the first three months of mapping using the neutron spectrometer instrument, part of the gamma ray spectrometer instrument suite. The central meridian in this projection is zero degrees longitude. Topographic features are superimposed on the map for geographic reference.