This time-lapse video by Northrop Grumman shows part of the pathfinder (test) backplane. Attached to this center section of the backplane are the secondary mirror booms. The telescope's secondary mirror will sit at the end of these booms. Because the telescope is folded for launch, the booms must deploy afterwards. This video shows one of the tests of the deployment of the booms.
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Credit: Northrop Grumman
