The Space Launch System (SLS), the heavy-lift rocket NASA is building at the behest of Congress to support future deep-space exploration missions, recently cleared two key milestones in its early development process, the space agency said. The system requirements and system definition reviews set down the cost, schedule, performance and design requirements for the future heavy lifter, NASA said in a July 25 press release. Having passed these reviews, the SLS can proceed toward its preliminary design review, which is scheduled for late 2013, NASA said.
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