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.

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。

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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.

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。

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The National Research Council, a non-profit group advising on science policy, said Nasa should increase the size of its space-flying crew.

国家研究理事会，为科学政策提供意见的一个非赢利组织，指出，美国宇航局应该扩大其空间飞行机组人员。

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Mark Albrecht, former Executive Secretary of the White House National Space Council.

CENTERFORSECURITYPOLICY: Center For Security Policy

W. Bush as executive secretary of the National Space Council.

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Brian Dailey, former Executive Director of the National Space Council.

CENTERFORSECURITYPOLICY: Center For Security Policy