Contact: Rob Gutro
NASA/Goddard Space Flight Center
Caption: The OTE (Optical Telescope Element) Simulator or OSIM wrapped in a silver blanket on a platform, is being lowered down into a vacuum chamber (called the Space Environment Simulator, or SES) by a crane to be tested to withstand the cold temperatures of space.
Credit: NASA/Chris Gunn
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Related news release: NASA Goddard engineers testing Webb Telescope's OSIM and BIA instruments