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The initial variant of SLS, Block 1, was required by the U.S. Congress to lift a payload of 70 t (69 long tons; 77 short tons)[30] to low Earth orbit (LEO), but it was later planned to exceed that requirement with a rated payload capacity of 95 t (93 long tons; 105 short tons).[31] As of 22 December 2019, this variant is planned to launch Artemis 1, Artemis 2, and Artemis 3.[32] The later Block 1B is intended to debut the Exploration Upper Stage and launch the notional Artemis 4 through Artemis 7.[33] Block 2 is planned to replace the initial Shuttle-derived boosters with advanced boosters and would have a LEO capability of more than 130 t (130 long tons; 140 short tons), again as required by Congress.[30] Block 2 is intended to enable crewed launches to Mars.[27]
As of 2018 SLS was planned to have the world's highest-ever total LEO payload capability,[34][35] but not the world's highest ever injection mass.[36][37][38][needs update] The SLS is planned to launch the Orion spacecraft and use the ground operations and launch facilities at NASA's iconic Kennedy Space Center in Florida. The rocket will use the Launch Complex 39B at the Kennedy Space Center. The rocket's first launch is currently scheduled for 4 November 2021.
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