Readied for Testing
The pathfinder (or test) backplane of the James Webb Space Telescope is shown here at NASA Johnson. It's secondary mirror boom was extended in prep for cryogenic tests in NASA Johnson's giant Chamber A. Mounted on the pathfinder are two test primary mirror segments, and at the end of that boom structure, a test secondary mirror.
Image credit: NASA/Desiree Stover
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Taken on February 20, 2015