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NASA is undertaking a trio of closely-related programs to continue
human space exploration beyond low-Earth orbit: the SLS vehicle;
the Orion capsule, which will launch atop the SLS and carry
astronauts; and the supporting ground systems. As a whole, the
efforts represent NASA's largest exploration investment over the
next decade, potentially as much as $22 billion, to demonstrate
initial capabilities. Beyond 2021, NASA plans to incrementally
develop progressively more-capable SLS launch vehicles complemented
by Orion capsules and ground systems. This book examines the scope
of NASA's preliminary cost estimates for the three programs. It
examines the SLS program's progress toward and risks for its first
test flight in 2017; and the extent to which the SLS program has
plans in place to achieve its long-term goals and promote
affordability.
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