In March 2011 the Curiosity rover was housed in a space-simulation chamber to be put through its paces at simulated Martian temperatures and pressures. Curiosity is fully assembled with all primary flight hardware and instruments. The test chamber's door is still open. After the door is closed, a near-vacuum environment can be established, and the chamber walls flooded with liquid nitrogen for chilling to minus 130 degrees Celsius (minus 200 degrees Fahrenheit). A bank of powerful lamps simulates sunshine on Mars. The technician in the picture is using a wand to map the solar simulation intensities at different locations in the chamber just prior to the start of the testing.

NASA / JPL