太空拦截器：金穹防御计划的技术与挑战

Golden Dome calls for missile interceptors in orbit to defend the U.S. Companies are already lining up to build a system that doesn’t yet exist BY SARAH SCOLES S OMEWHERE IN THE WORLD, a missile’s engines ignite, and it lifts toward the sky. Somewhere above the world, satellites sense its launch. They, in turn, send out an alert, along with information about the missile’s path. Almost instantly an interceptor in orbit—essentially a big bullet—gets its own message: fire toward the missile. Ideally the space-based weapon strikes the missile early in flight, before the rocket can release a warhead or decoys, turning a threat to the U.S. into a bunch of debris. …