This undated artist's rendition released Thursday Sept. 29,2011 by NASA/Jet Propulsion Laboratory shows WISE (Wide-field Infrared Survey Explorer). NASA on Thursday, Sept. 29, 2011, said its sky-mapping spacecraft called WISE has discovered 911 of 981 of the largest asteroids and has found more than 90 percent of the biggest asteroids that might pose a threat to Earth. (AP Photo/NASA/JPL)
Read the article: NASA says it's mapped most of potential Earth-killing asteroids
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