This 2013 artist’s concept shows the NASA’s WISE spacecraft, in its orbit around Earth. In September of 2013, engineers brought the mission out of hibernation to hunt for more asteroids and comets in a project called NEOWISE. Graphic: NASA
A spacecraft that helped bolster planetary defense is now at the end of its operational mission. On Thursday, engineers at NASA’s Jet Propulsion Laboratory in California sent the Near-Earth Object Wide-field Infrared Survey Explorer (WISE) spacecraft into its final hibernation mode by shutting off its transmitter.