But two events in the past four years - a 2007 Chinese anti-satellite weapon test and a 2009 crash-in-orbit of two satellites - put so much new junk in space that everything changed, the report said.

但是过去四年中的两件事却向太空中投放了太多的垃圾，一是07年中国反卫星武器的测试，二是09年两个卫星的相撞。报道称，所有的事情都改变了。

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Yet the destruction of the Chinese Fengyun-1C in an anti-satellite missile test in 2007 accounts for more than a quarter of all catalogued objects in low-Earth orbit.

中国在2007年进行了反卫星导弹试验，风云一号卫星被摧毁。由此产生的太空碎片使记录在册的近地轨道物体增加了四分之一强。

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Satellite on-orbit test is a useful way to monitor satellite platform, on-orbit status and attenuation degree of sensors, and is the premise and base for satellite data's processing and application.

卫星在轨测试是监测卫星平台及其遥感器在轨运行情况及性能衰减程度的有效手段，也是卫星数据处理和应用的前提与基础。

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Factors that could cause actual results to differ include: in-orbit test or satellite failures, performance degradation, in-orbit risks and anomalies, or improper orbital placement of ViaSat-1.

ENGADGET: ViaSat-1 sends its first words through the stratosphere to cooing stateside relatives

In August, Iran performed a test of a rocket capable of launching a satellite into orbit.

CNN: Ahmadinejad: Iran welcomes Obama overtures

The new Catapult centre in satellite applications is intended to provide businesses with "access to orbit test facilities, to develop and demonstrate new technologies".

BBC: Plan to 'Catapult' UK space tech