James Webb Space Telescope Mirror Halfway Complete

Inside NASA's Goddard Space Flight Center's massive clean room in Greenbelt, Maryland, the ninth flight mirror was installed onto the telescope structure with a robotic arm on December 23, 2015. This marks the halfway completion point for the James Webb Space Telescope's segmented primary mirror. Engineers worked tirelessly to install the ninth primary flight mirror onto the telescope structure. The James Webb Space Telescope is the scientific successor to NASA's Hubble Space Telescope. It will be the most powerful space telescope ever built. Webb is an international project led by NASA with its partners, ESA (the European Space Agency) and the Canadian Space Agency. NASA Photo by Chris Gunn/UPI