NASA’s heavy-lift Space Launch System (SLS) should be able to reach the high-retrograde lunar orbit where the agency wants to reposition a small asteroid, based on the results of its successful preliminary design review (PDR). Top SLS managers at Marshall Space Flight Center say the planned 321-ft.-tall, 70-ton-capability block 1 vehicle passed muster with a series of review boards for a first flight in 2017. That unmanned mission is tentatively set to fly 7,000 km (4,350 mi.) behind the ...

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