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:Russian Land of Permafrost and Mammoths Is ThawingSeeking a Culprit When Bumblebee Carcasses Pile UpWater on the Moon: NASA claims 'significantly' more water on Moon than previously thoughtTainted Pork, Ill Consumers and an Investigation ThwartedStealing LauriYellowstone volcano: How huge banana-shaped magma pocket was discovered