So in a lot of ways this is like docking. And in some ways it's easier in that the ship SpaceX is docking with its own craft. 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. (17:26–17:33)
CLAIM
Asserts that orbital propellant transfer has never been demonstrated before.
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