WASHINGTON, DC - SEPTEMBER 29: NASA's Near-Earth Object (NEO) program executive Lindley Johnson listens during a news conference to discuss near-Earth asteroid findings at the NASA headquarters ... more 
WASHINGTON, DC - SEPTEMBER 29: NASA's Near-Earth Object (NEO) program executive Lindley Johnson listens during a news conference to discuss near-Earth asteroid findings at the NASA headquarters September 29, 2011 in Washington, DC. NASA said new findings show there are considerably fewer near-Earth asteroids in the mid-size range than previously believed. (Photo by Alex Wong/Getty Images) less 
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Getty Images | Photo By Alex Wong / Getty Images
Thu, Sep 29, 2011 2:54 PM EDT