Yes - kinetic kill ideas are pretty sound. http://en.wikipedia.org/wiki/Kinetic_bombardment#Project_Thor http://en.wikipedia.org/wiki/Kinetic_bombardment#Proje

Yes - kinetic kill ideas are pretty sound. http://en.wikipedia.org/wiki/Kinetic_bombardment#Project_Thor http://en.wikipedia.org/wiki/Kinetic_bombardment#Project_Tho... Lifting that much mass into orbit is pricy though.