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What is the plasma used in ion thrusters?

Question by Apaele Jhuse: What is the plasma used in ion thrusters?
Just a random question…

Best answer:

Answer by Big Daddy
You’re asking about the fuel? For traditional electrostatic thrusters, xenon has been the “fuel” of choice.

VASIMR can reportedly make use of different elements, but will be using hydrogen when tested on the ISS.

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