Roman Space Telescope team members inspect the primary mirror in the dark using flashlights and UV lights to help them see any contamination, inside the cleanroom at Goddard Space Flight Center, Greenbelt Md., July 2, 2025. The green glow of the room is due to a long exposure time, the green comes from a light on the left wall which indicates optimal airflow through the room. This photo has been approved for public release. NASA/Mike Guinto