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Webb Telescope Optical Testing Complete; Construction Progresses

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Optical testing has been completed on a replica of NASA's James Webb Space Telescope (JWST) while construction of the real McCoy reached a critical milestone. Engineers are testing nonflight equipment on a mockup called Pathfinder, which copies the Webb telescope's center section backplane. Engineers inspect the Pathfinder telescope after its second super-cold optical test at NASA's Johnson Space Center in Houston. Images courtesy of Chris Gunn/NASA. "Practice makes perfect," said Mark Clampin, Webb telescope observatory project scientist at NASA's Goddard Space Flight Center....Read full article

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