NASA's Webb Sunshield Undergoes Rocket Fitting, More Testing (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption In the photo, taken in the clean room at Northrop Grumman Corporation in Redondo Beach, the last sunshield stowing step for the spacecraft element was completed, after engineers rotated the aft Unitized Pallet Structure (UPS) in a full upward position and locked it. There are two UPSs--a forward and an aft one; the aft UPS is the longer one--seen on the right in this view. All five expansive sunshield membranes are folded up and pinned flat to the UPSs. The big silver truss-like structure in between the two UPSs is a structural substitute for the flight telescope element, which has already been tested separately. Credit NASA/Chris Gunn Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.