“…Furthermore, they will also reduce the propulsion system mass for satellite orbit maintenance and attitude control will be easier to maintain for extended periods of time, and reduce the cost of Low Earth orbit (LEO) to Geosynchronous Earth orbit (GEO) orbit transfers. Advanced propulsion will also extend our ability to explore the solar system and ultimately, enable interstellar missions especially in deep space constellations, such as ST-3 [10] (formerly DS-3 mission) or Terrestrial Planet Finder (TPF), and in Earth sensing missions, such as E0-1 [11]. To accomplish these goals, innovations are needed in low thrust chemical and electric propulsion technology, including thruster components, advanced propellants, power processing units, and feed system components.…”