Seven months ago, engineers stowed the tennis court-sized sun visor of the James Webb Space Telescope for the last time before it deployed a million miles from Earth.

They had tried three times how to use it from soup to nuts. When opened for the first time, a cable ended up in the wrong place. The second time, some of the adhesive holding the cable in line caused mechanical clogging. The third attempt after technicians cleaned up the stray dirt went smoothly, said Keith Parrish, NASAs …

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