Abstract:In view of space debris problem, the concept of space debris engine is put forward, which is based on the use of captured space debris that can be converted into usable propellant for engine. The engine proposed can pave the way for space debris removal and spacecraft life extension. For space debris pulverization, we use a ball mill to grind metal samples and a rotary knife mill to crush non-metallic materials. We found that the particle size of most powders can reach the order of micrometer. The way of powder propulsion is studied, and the electrostatic acceleration is used to accelerate the powder. The space debris engine discussed here is for the space debris removal mission, but the sustainable propellant supply concept we proposed in this paper will also facilitate the development of more powerful engines for future space missions including asteroid explorations.