It aims to hit the asteroid at a speed of nearly 24,000kmh to knock its orbit off course, to see if a future rock headed toward Earth can be moved away.
Nuclear Bombs and Gravity Tractors: The Weird Ways Earth Could Be Saved From an Asteroid newsweek.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from newsweek.com Daily Mail and Mail on Sunday newspapers.