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epa09614359 (FILE) - An undated handout file picture made available by the National Aeronautics and Space Administration (NASA) shows engineers and technicians working on the James Webb Space Telescope as they successfully completed the first important optical measurement of Webb's fully assembled primary mirror, called a Center of Curvature test, at NASA's Goddard Space Flight Center in Greenbelt, Maryland, USA (issued 01 December 2021). According to NASA, engineering teams have completed additional testing confirming NASA's James Webb Space Telescope (JWST) is ready for flight, and launch preparations are resuming toward Webb's target launch date on 22 December 2021, at 7:20 a.m. EST. Webb's primary mirror will collect light for the observatory in the scientific quest to better understand our solar system and beyond. The JWST is an international project led by NASA with its European (ESA) and Canadian (CSA) partners. EPA/NASA/Goddard/Chris Gunn HANDOUT HANDOUT EDITORIAL USE ONLY/NO SALES