James Webb Space Telescope experts give real-time updates in the final stages of the telescopes sunshield deployment. A major milestone, the successful shield tensioning will ensure Webbs mirrors stay cold enough to #UnfoldTheUniverse.
The five-layer, tennis court-sized sunshield is a critical part of the telescope because the infrared cameras and instruments aboard must be kept very cold and out of the Sun's heat and light to function properly.
About the sunshield: https://webb.nasa.gov/content/observatory/sunshield.html
Where is Webb?: https://www.jwst.nasa.gov/content/webbLaunch/whereIsWebb.html