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James Webb Space Telescope Primary Mirror Prepared for Testing at Johnson Space Center
The towering primary mirror of NASA's James Webb Space Telescope stands inside a cleanroom at NASA's Johnson Space Center in Houston, where it will undergo its last cryogenic test before it is launched into space in 2018. In preparation for testing, the "wings" of the mirror (which consist of the three segments on each side) were spread open. This photo, taken on May 13, 2017, shows one fully deployed wing, and one that is moments from being fully deployed. An engineer observes the move. NASA Photo by Chris Gunn/UPI

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James Webb Space Telescope Primary Mirror Prepared for Testing at Johnson Space Center
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