HOUSTON—NASA, moving aggressively to meet an initial target date set by Congress for the first launch of the Space Launch System (SLS), invested nearly twice the original $40.5 million estimate for the construction of tank test stands, according to the agency’s inspector general. The complex assembly of the steel eight-story Test Stand 4697 for the core stage’s liquid oxygen tank and the 23-story test stand 4693 for the liquid hydrogen tank at Marshall Space Flight Center ...

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