A James Webb Space Telescope Mirror Takes a Short Trip

This is the James Webb Space Telescope ETU (engineering test unit) primary mirror segment returning to the cleanroom at NASA Goddard after undergoing some tests at our new Calibration, Integration, and Alignment Facility (CIAF). Credit: NASA/Goddard/Chris Gunn NASA image use policy. NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission. Follow us on Twitter