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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-07 and was most recently seen on 2026-05-07.
The Exploration Upper Stage (EUS) was a planned rocket stage for NASA's Space Launch System (SLS) during 2013 to 2026. It was intended for use on the proposed SLS Block 1B and Block 2 configurations, replacing the Interim Cryogenic Propulsion Stage (ICPS) used on the Block 1 variant. The EUS was designed to be powered by four RL10C-3 engines burning liquid oxygen and liquid hydrogen, producing a combined thrust of 433.1 kN (97,360 lbf). Although it progressed through a number of design milestones, the stage never entered full-scale hardware production and was ultimately cancelled, before flight. Its first launch had most recently been planned for Artemis IV in 2028.
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