Elon Musk: “Falcon 9 is the first rocket where the boost stage is…”

“So it's never, no one has ever created a fully reusable orbital heat shield before. And in fact no one has created a fully reusable orbital rocket before. And Falcon 9 is the first rocket where the boost stage is reusable on a regular basis. and where it actually makes economic sense. So solving the heat shield problem is I think, probably the single biggest remaining challenge for starship and of course getting the upper …” (03:31–03:43)

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