You can’t get very far, very fast on an Ion Thruster: when compared to conventional rockets, ion thrusters can’t even compare. However, what makes these engines so cool is that, over time, they just keep getting faster and faster. NASA’s Evolutionary Xenon Thruster (NEXT) has been running almost 5 years non-stop.
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The NEXT thruster is about 10 times more fuel-efficient that conventional rocket engines, but because it can take so long to get moving to any really useful speed,