A high-energy laser mounted on a US military aircraft has shot down a ballistic missile in the first successful test of the weapon, the US Missile Defense Agency said on Friday. The experiment -- evoking a scene out of a science fiction film -- was carried out off the central California coast at Point Mugu Naval Air Warfare Center at 8:44 pm Thursday Pacific time (0444 GMT), the agency said in a statement. "The Missile Defense Agency demonstrated the potential use of directed energy to defend against ballistic missiles when the Airborne Laser Testbed (ALTB) successfully destroyed a boosting ballistic...