WASHINGTON, DC - MARCH 19: Gen. William Shelton, head of the U.S. Air Force Space Command, prepares to testify before the House Science, Space and Technology Committee in the Rayburn House Office ... more 
WASHINGTON, DC - MARCH 19: Gen. William Shelton, head of the U.S. Air Force Space Command, prepares to testify before the House Science, Space and Technology Committee in the Rayburn House Office Building on Capitol Hill March 19, 2013 in Washington, DC. The committee asked government and military experts about efforts to track and mitigate asteroids, meteors and other "near Earth objects." (Photo by Chip Somodevilla/Getty Images) less 
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Getty Images | Photo By Chip Somodevilla / Getty Images
Tue, Mar 19, 2013 11:43 AM EDT