Curious Mars
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Mars: May 2017


Lighter-toned bedrock that surrounds fractures and comprises high concentrations of silica -- called "halos"-- has been found in Gale crater on Mars, indicating that the planet had liquid water much longer than previously believed.

We present improved Mars Odyssey Neutron Spectrometer (MONS) maps of near-surface Water-Equivalent Hydrogen (WEH) on Mars.