Original Mission: Launched in December 2009, the $300 million probe carried a telescope and a camera to survey the entire sky for 10 months. It captured nearly 2 million images.
Secret to Survival: Though the robot ran out of coolant after completing its mission last October, two of its four cameras kept working above their normal operating temperature of –430°F.
Second Life: NASA snapped another million images over the next four months, turning up more than 33,000 new asteroids.
Current Status: WISE remains in Earth orbit, awaiting new orders.