NASA has delayed an expected decision on whether to bring a small asteroid or a boulder from a larger one into lunar orbit for astronauts to study, citing questions about whether the estimated $100 million more the second option would cost would be worth the technology gained for future human missions on the path to Mars. Associate Administrator Robert Lightfoot said Dec. 17 the decision likely will be delayed until early next year, in time to support a mission concept review (MCR) at the ...


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