Explore NASA Goddard's Clean Room with Laura Betz

Science Writer Laura Betz takes us behind the scenes inside the world's largest clean room at NASA's Goddard Space Flight Center, in Greenbelt, Maryland. Explore where Hubble was built and where its successor the James Webb Space Telescope is being assembled today. See the special gowning process engineers go through on a daily basis to enter this super clean environment. This tour gives you a 360 look from the unique filter wall to the storage of Webb's 18 gold plated mirrors. Check out Goddard's Space Environment Simulator, a massive thermal vacuum chamber where scientists and engineers cryo-tested the heart of the telescope, ISIM, by lowering the temperature of the structure to 42 Kelvin (-384.1 Fahrenheit or -231.1 Celsius) and below to ensure that it can withstand the frigid temperatures Webb will face one million miles out in space.