NASA is revealing its most detailed assessment yet of the design challenges that are being tackled as part of its plan to develop and test the heavy-lift Space Launch System (SLS) vehicle for human exploration from 2017 and beyond. While the overall SLS effort remains on track, and even ahead of schedule in some cases, NASA says significant design issues have had to be overcome in some areas to cope with the unexpectedly high liftoff and ascent loads of the powerful vehicle. The key ...


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