A Warning from the Asteroid Hunters by Dr. Ed Lu and Martin Rees

Eyes were looking up at Asteroid 2012 DA14’s fly-by approach on February 15, but the surprise explosion over Chelyabinsk captured the world’s attention.  As Asteroid 2012 DA14 made its approach towards Earth on February 13-15, 2013, ultimately passing just 17,000 miles from our planet (that’s less...