White House Adviser: US Must Prepare for Asteroid

White House Adviser: US Must Prepare for Asteroid: "(Oct. 25) -- If an asteroid were on a collision course with Earth, would we be ready to defend against its destructive impact or would we be helpless and defenseless?

NASA, America's space agency, is being charged with leading the way to protect not only the U.S. but the entire world in the event of such a horrifying scenario. And a top White House science adviser says we have to be prepared."