The highest-performing rocket engine ever tested burned molten lithium with cyrogenic fluorine, plus added hydrogen for some light reaction mass.

This has never been developed for actual flight, in significant part because it's terrifying.

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@starkatt And in small part because it's far more expensive and only slightly more powerful than an LH₂/LO₂ rocket.

This is actually a trivium I like to bring up when discussions about rocketry happen! (which is surprisingly often, probably due to the company I keep. that's a good thing!)

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