Quote:
Originally Posted by Stomoxys
The ramjet mode of the SABRE engine is air breathing, burning fuel using oxygen from the surrounding air, so it is useless in an atmosphere with no oxygen.
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Yes, scramjets need oxygen atmospheres but our Solar System is an example of how few desirable places that rules out.
Even Titan is a sort of "There must be something worth landing there for". The upper atmosphere of Venus might be achievable but why are you going there?