美国全国研究委员会称,美国空间监测网跟踪并登记在册的太空垃圾数量在2006年12月为9949个,而在2011年7月就上升到了16094个。
The amount of orbital debris tracked by the US Space Surveillance Network jumped from 9, 949 cataloged objects in December 2006 to 16, 094 in July 2011, the National Research Council said.
一份由国家研究委员会作出的新报告警告称,地球轨道上太空垃圾的问题濒临失控的边缘。
A new report by the National Research Council warns that the problem of space junk in earth's orbit is on the verge of getting out of control.
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