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RT ELON CLIPS (@ElonClipsX)Elon Musk: We'll hopefully demonstrate orbital propellant transfer next year.“One of the other technologies that's key for Mars is doing orbital propellant transfer. So you can think of this like similar to aerial refueling for airplanes, but in this case it's orbital refilling of rockets, which has never been done before. But it is, you know, technically feasible.I always feel like these things are a little NSFW sort of. Listen, you've got to transfer fluid somehow. This has got ...