NASA continues to fall short of its own requirements for fiscal caution in developing the heavy-lift Space Launch System (SLS), and "may be $400 million short of what the program needs to launch by 2017," the watchdog Government Accountability Office (GAO) says. Despite other GAO warnings, the U.S. space agency has not met a 70% confidence level in its business plan for the big new rocket, which is intended to eventually carry human explorers to Mars. While finding the development ...

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