Basically, this was a plan made by the American government as an alternative to nuclear weapons, and [i]is still being considered[/i] as an alternative. It basically consisted of a orbital weapons satellite, loaded with 100 60 meter rods of tungsten. These would be dropped on key locations and the velocity and density of it would be enough to wipe out entire city blocks. Now, you’re thinking, “oh, its just dropping shit on people from high up?” No. Tungsten has the same density as gold. You can fit a literal ton of gold into one cubic meter. So imagine 60 cubic tons of metal being dropped from orbit, almost impossible to detect until reentry. The velocity would annihilate multiple city blocks with a single one. Yeah. Pretty terrifying.