A concept of NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life. In this picture, the rover examines a rock on Mars with a set of tools at the end of the rover's arm.

A concept of NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life. In this picture, the rover examines a rock on Mars with a set of tools at the end of the rover's arm.. Learn more.