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A comment on A SpaceX booster now trails only 4 space shuttles in flight experience. Parent comment

Re:A SpaceX booster now trails only 4 space shuttles in flig... by maccam94 on Tuesday May 11, 2021 @06:19PM (#27124315)
Water yes, but I haven't seen anything about CO2 so I think you're stuck with hydrogen-oxygen engines (which have different tradeoffs than methane-oxygen engines).

https://everydayastronaut.com/raptor-engine/ (scroll down to the text immediately above the RP1/Methane/Hydrogen chart)

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Re:A SpaceX booster now trails only 4 space shuttles in flig... by rbanffy on Tuesday May 11, 2021 @07:15PM (#27124819)
There is a lot of oxygen on the Moon (combined with silicon and aluminum), but carbon is not readily available, so it'd be more favorable to hydrolox engines.
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