NASA Space Shuttle DiscoveryNASA Space Shuttle Discovery Assemble me. Take a journey to space with me! The Space Shuttle Discovery was the third of five reusable NASA orbiters, making 39 launches and landings between 1984 and 2011the most flights of any spacecraft in history. Perhaps its greatest accomplishment was the deployment of the Hubble Space Telescope (HST) on April 25, 1990, revolutionizing astronomy and astrophysics, particularly our understanding of the age and