This image depicts the science result from the Mars rover Curiosity's CheMin instrument, showing an X-ray diffraction of the rover's fifth scoop of Martian dirt. The black semi-circle at the bottom is... more 
This image depicts the science result from the Mars rover Curiosity's CheMin instrument, showing an X-ray diffraction of the rover's fifth scoop of Martian dirt. The black semi-circle at the bottom is the shadow of the beam stop. Image released less 
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SPACE.com | Photo By Science/AAAS
Thu, Sep 26, 2013 2:06 PM EDT