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methane × 28mars × 13
curiosity × 5
spacex × 4
spacex-starship × 4
atmosphere × 3
liquid-fuel × 3
astrobiology × 3
cryogenics × 3
iss × 2
fuel × 2
spacesuits × 2
power × 2
life × 2
thermal × 2
oxygen × 2
titan × 2
lox × 2
raptor × 2
trace-gas-orbiter × 2
engines × 1
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rovers × 1
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