Under the original Artemis architecture, NASA planned on multiple versions of the SLS rocket, ranging from the "Block 1" vehicle currently in use to a more powerful EUS-equipped Block 1B and eventually an even bigger Block 2 model using advanced solid rocket boosters. The latter two versions required use of a taller mobile launch gantry, already well under construction at the Kennedy Space Center.
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Now Artemis III will stay closer to home - a crew will head to low-Earth orbit in 2027 to practice docking with a lunar lander.
Tony Jolliffe/BBC News