| 1. | An R-4D bipropellant rocket motor and four XIPS-25 ion engines provide propulsion.
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| 2. | The focus of this mission phase was on the ion engine systems.
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| 3. | This could work well with an ion engine, for example, as mentioned previously.
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| 4. | This kind of slow, patient acceleration means that ion engines are extremely efficient.
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| 5. | Star Wars films and literature refer to twin ion engines ( TIE ) starfighters.
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| 6. | Ion sources are used to form ions for ion engines.
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| 7. | The space probe would be powered by an ion engine.
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| 8. | Ion engines can make much more efficient use of propellant than existing chemical rockets.
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| 9. | Another promising technology, tested on " Deep Space 1 ", is the ion engine.
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| 10. | The spacecraft features ion engines, upgraded guidance and navigation technology, antennas and attitude control systems.
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