It is all but certain that NASA’s heavy-lift Space Launch System (SLS) will miss its first flight, scheduled for the end of 2017. NASA is 90% sure the 70-ton SLS will be delayed and thinks it will need $400 million to cover the estimated six-month slip. The Government Accountability Office (GAO), which reported the estimate, finds “the development schedule of the core stage, which is driving the overall program schedule, is aggressive and substantial amounts of schedule that the ...

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