NASA Wakes Up: 'Saving Us From Killer Asteroids' Is A WasteForbesIn 1908, the Tunguska event leveled an area about 40 miles in all directions: an airborne explosion from a meteor caused a tremendous amount of ...Space Agencies Team Up Against Killer Asteroids"To protect Earth from potentially hazardous impacts, we need to understand asteroids much better."Nadya Agrawal- The Huffington Post-