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. via NASA go.nasa.gov/2rn8dB8

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