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Asteroids vs. comets: NASA expert assesses the cosmic threats to Earth - NBCNews.com (blog)
URL: http://cosmiclog.nbcnews.com/_news/2013/01/25/16702712-asteroids-vs-comets-nasa-expert-assesses-the-cosmic-threats-to-earth?lite
Submitted: Sat Jan 26 2013
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CT: UFOSeek News 2013: Asteroids vs. comets: NASA expert assesses the cosmic threats to Earth - NBCNews.com (blog)
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This is why Congress asked NASA in 1998 to identify 90 percent of the asteroids wider than a kilometer (0.6 miles). In 2011, NASA researchers declared that they achieved that goal. But they still have a long way to go to identify the smaller threats ...