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Testing an ion engine. grids typically comes from solar panels. Among the inner planets there is sufficient power to run the engine at full power, but beyond this there is less and less solar energy available to collect. In these deeper space missions, the heat from onboard nuclear fuel is used to generate the electricity needed to create the ions and charge the grids of the ion engine. Unlike chemi- cal rockets, which generally are either on or off, ion engines can operate at a variety of thrust levels. The NSTAR ion thruster engine can throttle down from 2.5 kW to a minimum of 500 W to conserve fuel on long missions. Finally, because they can operate for such long periods, ion engines can be used in station keeping for Earth-orbiting satellites. A geosynchronous orbit keeps a satellite located above the same spot on the equator all the time. Gravitational forces of the Sun and Moon cause this orbit to change by about 1° a year, so some propulsion is needed to counteract this and keep these satellites in the correct orbit. An ion engine is perfect for the job. 22 Ion EnginesPDF Image | NASA Guide to Engines
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