An Air Force space program, nicknamed Rods From God, aims to hurl cylinders of tungsten, titanium or uranium from the edge of space to destroy targets on the ground, striking at speeds of about 7,200 miles an hour with the force of a small nuclear weapon.
They've been dropping stuff from near the edge of space for a long time. One of the best are large hunks of concrete we call bunker busters. some have no explosives at all, and smaller ones are low collateral damage bombs.