This image of a calibration target illuminated by ultraviolet LEDs (light emitting diodes) is part of the first set of nighttime images taken by the Mars Hand Lens Imager (MAHLI) camera at the end of ... more 
This image of a calibration target illuminated by ultraviolet LEDs (light emitting diodes) is part of the first set of nighttime images taken by the Mars Hand Lens Imager (MAHLI) camera at the end of the robotic arm of NASA's Mars rover Curiosi less 
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SPACE.com | Photo By NASA/JPL-Caltech/MSSS
Fri, Jan 25, 2013 11:36 AM EST