| 11. | Another dead end came in attempts to use buckyballs as a fuel for ion engines.
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| 12. | Propulsion is provided by an R-4D-15 apogee motor, with four XIPS-25 ion engines for stationkeeping.
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| 13. | :The problem with an ion engine is, that it needs a lot of energy to work.
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| 14. | But if conventional rockets are the hares of the Space Age, ion engines are the tortoises.
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| 15. | "That's no way to run an ion engine,"
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| 16. | An ion engine would also allow access to multiple latitudes and altitudes to optimize relay contacts.
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| 17. | Written for a juvenile audience, they had a scientific foundation, anticipating such advances as ion engines.
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| 18. | At times, the ion engine will be turned off and the spacecraft will coast, engineers said.
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| 19. | Ion engines deliver 10 times more thrust than a conventional engine for a given amount of fuel.
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| 20. | Despite the eerie blue glow it emits, Deep Space 1's ion engine hasn't hit warp speed yet.
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