The Space Launch System (SLS) is an American super heavy-lift expendable launch vehicle used 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 SLS reuses hardware from the 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. All Space Launch System flights are launched from Launch Complex 39B at the Kennedy Space Center in Florida. The first three SLS flights use the Block 1 configuration, comprising a core stage, extended Space Shuttle boosters developed for Ares I and the ICPS upper stage. An improved Block 1B configuration, with the Exploration Upper Stage, is planned to debut on the fourth flight; a further improved Block 2 configuration featuring new solid rocket boosters is planned to debut on the ninth flight. After the launch of Artemis 4, NASA plans to transfer production and launch operations of SLS to Deep Space Transport LLC, a joint venture between Boeing and Northrop Grumman.
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