Here’s how NASA is preparing the largest telescope ever built for space

Watch NASA's James Webb Space Telescope getting prepared for its 2019 launch. The telescope has now successfully passed all the necessary tests which ensured that it's going to withstand the "rigors of launch" as well as the extremely cold temperatures and the airless conditions in space. The only steps left at the moment are for the JWST to get equipped with its sunshield and get attached to the spacecraft bus that will take it to space.