Data acquired by the gamma ray and neutron detector (GRaND) on board the NASA Dawn spacecraft have been analyzed to determine the distribution of hydrogen on the giant asteroid Vesta. Image released ... more 
Data acquired by the gamma ray and neutron detector (GRaND) on board the NASA Dawn spacecraft have been analyzed to determine the distribution of hydrogen on the giant asteroid Vesta. Image released September 20, 2012. less 
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SPACE.com | Photo By Thomas H. Prettyman
Thu, Sep 20, 2012 3:00 PM EDT