This image shows a simulation of asteroid 2012 DA14 approaching from the south as it passes through the Earth-moon system on Feb. 15, 2013. The 150-foot object passed within 17,000 miles of the Earth. (Associated Press/NASA/JPL-Caltech)

Photo by: Uncredited

This image shows a simulation of asteroid 2012 DA14 approaching from the south as it passes through the Earth-moon system on Feb. 15, 2013. The 150-foot object passed within 17,000 miles of the Earth. (Associated Press/NASA/JPL-Caltech)