What was Project Excalibur?

Introduction Project Excalibur was a Lawrence Livermore National Laboratory (LLNL) Cold War-era research programme to develop an X-ray laser system as a ballistic missile defence (BMD) for the United States. The concept involved packing large numbers of expendable X-ray lasers around a nuclear device, which would orbit in space. During an attack, the device would… Read More


What was Zenith Star?

Introduction Zenith Star was a Directed-energy weapon that started development as part of the US Strategic Defence Initiative. Background Zenith Star included the Alpha laser, a high energy hydrogen fluoride chemical laser, and the LAMP mirror which was a 7 segment adaptive optics mirror. It was never put in orbit, but the Alpha LAMP Integration… Read More

What was the Strategic Defence Initiative?

Introduction The Strategic Defence Initiative (SDI), nicknamed the “Star Wars programme”, was a proposed missile defence system intended to protect the United States from attack by ballistic strategic nuclear weapons (intercontinental ballistic missiles and submarine-launched ballistic missiles). The concept was first announced on 23 March 1983 by President Ronald Reagan, a vocal critic of the… Read More