This month, NASA's Orbital Debris Program Office released data naming the top ten incidents contributing to the space junk problem.

本月美国太空署轨道碎片项目办公室公布了一份数据，显示了造成太空垃圾的十大事件。

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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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According to NASA there are about 20, 000 pieces of space junk bigger than 10cm (3.9 inches) and its chief scientist for orbital debris Nicholas L. Johnson says most robotic satellite missions are vulnerable to particles as small as 5mm (0.2 inches) -- there are thought to be millions of those in orbit.

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