@NASAWebbTelescp when will it be finished
#JWST's telescope structure poised for mirror assembly! View from below the assembly stand: http://go.nasa.gov/1MVk5wz pic.twitter.com/ngAm94KMVZ
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@bigdavid565657 The mirrors? By spring. But then there is cryotesting, the attachment of sunshield/spacecraft bus, and more. 2018 launch!
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