Webb Secondary Mirror Deployed

Caption: Webb's secondary mirror support structure is seen above the telescope's primary mirror in a clean room at Northrup Grumman's facility in Redondo, California, in 2019.
Credit: Northrop Grumman
Flight controllers at the Space Telescope Science Institute in Baltimore deployed the secondary mirror on the James Webb Space Telescope (JWST) on Jan. 5, as the list of critical reconfigurations to prepare the observatory for its unprecedented science mission neared completion. The fifth and final...

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