The first rule of wing-walking is: Never let go of what you have until you have a firm grip on the next thing. President Barack Obama’s Fiscal 2011 budget proposed to Congress would have NASA take the risky step of ignoring this rule in its human spaceflight endeavors (see p. 20). It is a gamble—scrapping the government’s Constellation program that was to have returned U.S. astronauts to the Moon by 2020 and turning to commercial alternatives instead. If it pays off, history may record ...


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