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Keeping a 'Trained Eye' on the James Webb Space Telescope

NASA and Northrop Grumman are keeping a "trained eye" on the James Webb Space Telescope, by training their engineers on how to handle and assemble the telescope's Optical Telescope Element (OTE).
James Webb Space Telescope Mirror Completes Cryogenic Testing

The first mirror segment that will fly on the James Webb Space Telescope has completed its first series of cryogenic temperature tests in the X-ray and Cryogenic Facility.
James Webb Telescope Mirrors Chill Out at Marshall

The first of 18 mirror segments of the James Webb Space Telescope arrived this week at Marshall Center for testing at Marshall’s X-ray & Cryogenic Facility.