NASA Testing the James Webb Space Telescope Pathfinder

In this photograph taken on Sept. 1, 2016, the James Webb Space Telescope Pathfinder structure has been configured for the Thermal Pathfinder Test at NASA Johnson Space Center's giant thermal vacuum chamber, called Chamber A. The Pathfinder is a test version of the structure that supports the telescope. via NASA http://www.nasa.gov/image-feature/testing-the-james-webb-space-telescope-pathfinder