DE-STAR: Phased-Array Laser Technology for Planetary Defense and Other Scientific Purposes, that involves blowing stuff up!!, :( :( :(
Current strategies for diverting threatening asteroids require dedicated operations for every object. We propose a standoff, Earth-orbiting system capable of vaporizing the surface of asteroids as a futuristic but feasible approach to impact risk mitigation. We call the system DE-STAR (Directed Energy System for Targeting of Asteroids and exploRation). DE-STAR is a modular phased array of laser amplifiers, powered by solar photovoltaic panels. Low-cost development of test systems is possible with existing technology. Larger arrays could be tested in sub-orbital demonstrations, leading eventually to an orbiting system. Design requirements are established by seeking to vaporize the surface of an asteroid, with ejected material creating a reaction force to alter the asteroid’s orbit. A proposed system goal would be to raise the surface spot temperature to >3,000K. Engagement distance required for successful diversion depends on the asteroid’s mass, composition and approach velocity. Distance to focus and desired surface spot temperature then determine laser
array size. Volatile-laden objects ~100m wide approaching at 5km/s could be diverted by engaging at ~0.05AU, requiring an array of ~100m side length. Phased array configuration allows multiple beams; a single DE-STAR would be capable of targeting several threats simultaneously. An orbiting DE-STAR could serve diverse scientific objectives, (or be used in its alter ego mode a dis-a-ster cannon)
