This policy, Nasa hopes, will free resources to invest in a new capsule and rocket capable of sending humans beyond the space station to destinations such as the Moon, asteroids and Mars.

宇航局希望，这一政策将解放资源，以便将更多精力投入到开发新的飞船和火箭，将人送上远于外太空的距离如月球、小行星和火星。

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Lacking of fault samples is a knotty problem in the fault detection of complex systems such as Liquid-propellant Rocket Engines (LRE).

在对类似于液体火箭发动机这种复杂系统的故障检测过程中，一个非常棘手的问题是缺乏故障类样本。

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A nuclear rocket such as this would be inherently safe and environmentally harmless: contrary to popular belief, a nuclear rocket need not be strongly radioactive when launched.

这种核能燃料火箭有其固有的安全性，而且对环境没有危害。与普通的看法相反，核燃料火箭在发射时未必有很强的核辐射。

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It said that, although Nasa was taking steps to protect the shuttle from orbital debris such as spent rocket bodies, satellite fragments and paint chips - there was a real risk that a collision could cripple the shuttle or threaten the safety of the crew.

BBC: Was Columbia struck by space debris?

Putting a satellite into orbit on a long-range rocket as it did in December is a lot different from delivering a warhead to a desired location on such a rocket.

WSJ: North Korea Puts Artillery Forces on Combat Alert

What will be interesting to see now is whether Congress, having made such a fuss about the need for this rocket, will stay the course and continue to fund it as federal funds get squeezed on all sides.

BBC: SLS: The rocket in need of a destination