NASA asteroid Bennu mission: Why is space agency sending craft to giant space rock? A NASA spacecraft is set to reach a potentially Earth-threatening asteroid today more than two years after it started its journey. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:The Health Issue: What Animals Taught Me About Being HumanUnder Fire, Climate Scientists Unite With Lawyers to Fight BackMystery sea beast IDENTIFIED: Scientists find out what washed up in IndonesiaThe Health Issue: The Genetics of Pooched-Out PoochesThe Health Issue: The Mystery of the Wasting House-CatsProxima b SHOCK: 'Second Earth' COULD support alien life after all, scientists reveal