Abstract
Despite its scientific successes, NASA has over the past two decades lost its way, spending billions of dollars on transportation systems that have at bottom been failures. President Obama's cancellation of the costly and unwieldy Constellation program provides an opportunity for genuine reform of the agency and the US space program, through harnessing the innovatory and cost-effective power of commercial entrepreneurs. Examples of the kinds of project they might undertake – including solar power satellites, ‘space taxis’ and a space elevator – are discussed.
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