| 21. | On 4 November 2009, the ion engine D automatically stopped working due to an anomaly from degradation.
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| 22. | Cautious ground controllers will wait a week or two before firing up Deep Space 1's ion engine.
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| 23. | Deep Space 1's ion engine will run on 180 pounds ( 82 kilograms ) of xenon gas.
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| 24. | :: The same might happen to ion engines and anything that follows ( for quite some time ).
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| 25. | In the much slower real world, solar-powered ion engines are 10 times more efficient than traditional chemical engines.
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| 26. | Or, this might be a good application for ion engines, which are more efficient, but have very low thrust.
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| 27. | One mission proposed using the electricity to power ion engines, calling this method radioisotope electric propulsion ( REP ).
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| 28. | On 28 August, " Hayabusa " was switched over from the ion engines to the bi-propellant thrusters for orbital maneuvering.
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| 29. | Rayman says that, over time, ion engines can deliver 10 times more thrust per pound of fuel than chemical rockets.
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| 30. | To avoid a lapse in propulsion, the mission team hastily exchanged the active ion engine and electrical controller with another.
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