Rods from God
A proposed weapon concept in which metal rods held in orbit are dropped toward Earth, destroying targets with the kinetic energy of the fall rather than explosives. It has only ever been studied and proposed, never deployed.
1950s engineer Jerry Pournelle proposed dropping tungsten rods from satellites. Project Thor ("Rods from God") drops 6.1 m × 30 cm rods at Mach 10 with ~11.5 tonnes of TNT energy. Not a nuke, so no fallout — and the 1967 Outer Space Treaty's ban on "WMDs in orbit" doesn't apply.
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