Elon Musk: “With full reusability and propellant transfer we, those are…”

“But no one has ever demonstrated propellant transfer in orbit to the best of our knowledge. And so this would be propellant transfer at a very large scale. And, but With full reusability and propellant transfer we, those are the key technologies needed for building a city on Mars. And I'm confident that the SpaceX team, which is incredibly talented, will achieve this these goals and we will be landing ships on Mars in the future and building life …” (17:38–17:48)

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