INDIANAPOLIS—Contractors for NASA’s Space Launch System heavy-lift rocket indicate the agency’s decision to put the core stage through a “green run” full-scale ground test means first launch is more likely in 2021, as they enter a final phase of integrated structures, engines and systems testing. Although NASA still is officially targeting late 2020 for the SLS debut in the Artemis-1 test mission, the agency is widely expected to acknowledge the slide as part ...

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