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The report, Limiting future collision risk to spacecraft, was commissioned by Nasa last April to evaluate its programmes on 'space junk', officially known as MMOD (Micrometeoroids and Orbital Debris).

一份旨在限制未来这些碎片可能会对航空飞船造成的危险的报告在去年的四月份由宇航局发布，用来评估他们关于太空垃圾，名为MMOD（微流星体和太空碎片）的项目。

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LEO, not Earth, is the perfect place to develop the industry we need in order to make orbital spacecraft a viable business.

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This network is a set of geostationary communications satellites (ie, spacecraft that have an orbital period of 24 hours, and so hover over the same place).

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Later this year two spacecraft, one which has been designed by Orbital Sciences, a Virginia-based firm, and another by SpaceX, a Californian company run by Elon Musk, an internet entrepreneur, will make cargo runs to the ISS. The hope is that such craft will soon be able to carry humans too, and at a far lower cost than NASA's efforts.

ECONOMIST: The space shuttle