This instrument, shown prior to its September 2010 installation onto NASA's Mars rover Curiosity, will aid future human missions to Mars by providing information about the radiation environment on Mars and on the way to Mars. It is the Radiation Assessment Detector, or RAD, one of 10 science instruments for the Mars Science Laboratory mission, which will land Curiosity on Mars in August 2012. Credit: NASA/JPL-Caltech/SwRI