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When the administration decided last year to speed up NASA’s human lunar exploration blueprint by four years, it immediately hit a formidable obstacle.
The first Space Launch System (SLS) core stage, earmarked for an uncrewed mid-2020 flight test around the Moon, was not expected to be finished until August 2020.
Accessexclusive subscriber-only in-depth coverage on the plan to complete assembly of the first core stage.
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