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chemistry × 79fuel × 15
mars × 11
rockets × 11
planetary-science × 10
physics × 7
liquid-fuel × 6
materials × 6
atmosphere × 5
venus × 5
mining × 5
titan × 5
the-moon × 4
propulsion × 4
engines × 4
engineering × 4
ion-thruster × 4
life × 4
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combustion × 3
oxidizer × 3
thermodynamics × 3
moxie-oxygen-generator × 3
