A Parting Look at 2012 DA14: Was This a Warning Shot from Space?

Just as anticipated, on Friday, Feb. 15, asteroid 2012 DA14 passed us by, zipping 27,000 kilometers (17,000 miles) above Earth's surface -- well within the ring of geostationary weather and communications satellites that ring our world. Traveling a breakneck 28,100 km/hr (that's nearly five miles a second!) the 50-meter space rock was a fast-moving target for