Workers at the NASA Goddard Spaceflight Center in Maryland continue to prepare the James Webb Space Telescope for its October 2018 launch.
Installation of the James Webb Space Telescope Aft Optics Subsystem (AOS) in the cleanroom at NASA Goddard. This piece of hardware sits at the center of the JWST primary mirror and contains the tertiary and fine steering mirrors.
(NASA photo by DJ Emmanuel)
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