Space.com #World’s Largest Space Telescope Is Complete, Expected to Launch in 2018 2 November 2016 fborgosano Leave a comment Share: After more than 20 years of construction, the James Webb Space Telescope (JWST) is complete and, following in-depth testing, the largest-ever space telescope is expected to launch within two years, NASA officials announced today (Nov. 2). from Space.com ift.tt/2f1p9XW Share: