Is still agree with using nuclear arms against an asteroid. None of the hollywood bullshit where you land and drill a hole. 4 or 5 Tactical Nuclear Missiles (Minuteman III and Peacekeeper LGM 130 missiles can acheive escape velocity and reach space, since older ballistic rockets were used to launch man into space.) And blast the asteroid on one side. Now, this will not destroy it, but the force of 4 40 Megatonne Nukes will deflect it out of harms way.