So says the US National Research Council (NRC), which has flagged weaknesses in the country's nuclear sleuthing capability.

因此，美国国家研究理事会（NRC）已经标识了美国核侦探能力的弱点。

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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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In January this year, a report by the US National Research Council said the country must do more to tackle the asteroid threat.

BBC: Pan-Starrs telescope begins operations to hunt asteroids

In 1997, the US National Research Council said that Nasa should carry out a thorough risk assessment to determine the likelihood that the space shuttle could be severely damaged by meteoroids and orbital debris.

BBC: Was Columbia struck by space debris?