From NASA Webb: “Testing the Webb Telescope”
“Several critical items related to NASA’s next-generation James Webb Space Telescope currently are being tested in the thermal vacuum test chamber at NASA’s Goddard Space Flight Center, Greenbelt, Md.
This image shows the Optical Telescope Element Simulator, or OSIM, wrapped in a silver blanket on a platform, being lowered into the Space Environment Simulator vacuum chamber via crane to be tested to withstand the cold temperatures of space.”
Image Credit: NASA/Chris Gunn
The article is here.
Webb is an international collaboration between NASA, the European Space Agency (ESA), and the Canadian Space Agency (CSA). The NASA Goddard Space Flight Center is managing the development effort. The prime contractor is Northrop Grumman; the Space Telescope Science Institute will operate Webb after launch.