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terraforming × 119mars × 69
atmosphere × 28
venus × 23
colonization × 17
magnetic-field × 13
planetary-science × 12
orbital-mechanics × 8
the-moon × 8
water × 6
magnetosphere × 6
life × 5
astrobiology × 4
nuclear × 4
mining × 4
solar-wind × 4
co2-deposit × 4
design-alternative × 3
temperature × 3
future-missions × 3
chemistry × 3
oxygen × 3
saturn × 3
gravity × 2
law × 2