The Webb OSIM Going into Vacuum Chamber (IMAGE) 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 Usage Restrictions None License Licensed content 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.