WASHINGTON, DC – SEPTEMBER 29: NASA’s Near-Earth Object (NEO) program executive Lindley Johnson (L) speaks as principal investigator NEOWISE of NASA Amy Mainzer (R) 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)
