> They need the specific impulse that hydrogen offers.
They wanted it, sure: there's more than one way to build a big rocket, and the choice that Congress/NASA made was to use hydrogen on a sustainer stage.
They could have made other choices.
They wanted it, sure: there's more than one way to build a big rocket, and the choice that Congress/NASA made was to use hydrogen on a sustainer stage.
They could have made other choices.
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