Experts asked to review the us human spaceflight programme have given strong support to the use of commercial services to launch astronauts.

被要求回顾美国载人太空飞行规划的专家强烈建议使用商业服务来将宇航员送入太空。

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The Ares rocket is tentatively scheduled to be in service by 2015 but an influential review of Nasa's human spaceflight programme has cast doubt on its future.

战神火箭暂计划于2015年正式服役，然而一份有影响力的评估报告对NASA的人类太空计划前景表示了怀疑。

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He repeated his criticisms of the current direction of the US human spaceflight programme, saying it lacked ambition compared with the big thinking of the 1960s.

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The White House's chief scientist, John Holdren, said "it would be only prudent" to review the human spaceflight programme given the scale of its ambition and "the significant investment of both funds and scientific capital".

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Human spaceflight is an optional programme for Esa member states, and so far the UK has declined to invest in it.

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