Outer Space Treaty
The Outer Space Treaty is a foundational international space-law treaty that entered into force in 1967. It prohibits national appropriation of celestial bodies and the placement of weapons of mass destruction in orbit or on celestial bodies.
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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