The Space Launch System (SLS) is an American super heavy-lift expendable launch vehicle by NASA. As the primary launch vehicle of the Artemis Moon landing program, SLS is designed to launch the crewed Orion spacecraft on a trans-lunar trajectory. The first SLS launch was the uncrewed Artemis 1, which took place on 16 November 2022.
Development of SLS began in 2011, as a replacement for the retired Space Shuttle as well as the cancelled Ares I and Ares V launch vehicles. As a Shuttle-derived vehicle, the Space Launch System reuses hardware from the Space Shuttle program, including the solid rocket boosters and RS-25 first stage engines. A Congressionally mandated late 2016 launch was delayed by nearly 6 years.