NASA’s Exploration Mission-2 (EM-2), the first launch of a crew on the new Space Launch System (SLS), is being revised now that NASA has permission to build a second Mobile Launch Platform (MLP) and has reassessed the costs of human-rating the Interim Cryogenic Propulsion Stage (ICPS). NASA’s Bill Gerstenmaier said today that the idea now is to launch EM-2 on the initial version of SLS with ICPS, not the upgraded design with the more capable Exploration Upper Stage (EUS), and to move EM-2 forward in time. Using the less capable ICPS means changing what EM-2 will do, however.
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