Think of the moon as a gas station and the spaceship as your car. If you had to carry all the fuel with you for your cross-country road trip, your car would look a lot different than it does. The existence of gas stations allows us to build cars that are faster and more efficient.
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A refueling station would likely be constructed in stages and made to be modular, so accommodations for a larger program can be made in the future. Ion-propulsion engines use electricity to excite an inert gas – usually Xenon or Ammonia – to produce a powerful stream of Ions in a specific direction.
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