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http://www.nasa.gov/ 19-12-2007 20:20:32
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To help defend Earth from potentially hazardous asteroids and comets, we developed the #PlanetaryDefense Strategy & Action Plan. We’re eager to work with White House Office of Science & Technology Policy in implementing it. go.nasa.gov/3mI3MlZ Note: There are no known asteroid impact threats for 100+ years.