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Whither Human Spaceflight at the Start of the Second Decade of the 21st Century?
The first decade of the twenty-first century has offered both serious challenges and enormous potential for the development of new human launch vehicles that could finally achieve the long-held dream of reliable, affordable access to space. But at the end of the decade, the policy questions posed by the 2003 loss of Columbia about the future U.S. human spaceflight still loom large.