Image credit: NASA/JPL-Caltech This artist concept features NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life. Curiosity launched to Mars on November 26, 2011, and landed less than a year later on August 6, 2012. In this picture, the rover examines a rock on Mars with a set of tools at the end of the rover's arm, which extends about 2 meters (7 feet). More information about Curiosity is at mars.jpl.nasa.gov/msl/.