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JWST Pathfinder in front of Chamber A | by James Webb Space Telescope
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JWST Pathfinder in front of Chamber A

The full-scale ‪James Webb Space Telescope pathfinder (test version of our backplane) shown going into NASA Johnson's huge Chamber A for cryogenic testing. You can see the two spare primary mirror segments (one gold, one silver) mounted on it - the boom that holds the secondary mirror is fully extended. ‪


Credit: NASA/Chris Gunn


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Taken on March 12, 2015