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Ionic propulsion is useful for making precise movements in space, and can be used to travel to other worlds through techniques that involve periapsis (I do not remember the name of these techniques very well). Ionic propulsion has a very high isp, but a low thrust (just like in real life). In general, the average life of a deposit of xenon is much higher than that of any other fuel for space exploration. However, there comes ionic propulsion becomes useless in many goals. It's just very slow, and the game does not allow you to speed up time (over x4) while the ship is propelling its