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solar-wind × 42the-sun × 6
mars × 5
terraforming × 4
space-weather × 4
the-moon × 3
propulsion × 3
spacecraft × 3
radiation × 3
magnetic-field × 3
solar-sail × 3
orbital-mechanics × 2
atmosphere × 2
gravity × 2
probe × 2
space-station × 2
voyager × 2
shielding × 2
satellite-constellation × 2
cosmic-radiation × 2
meteoroid × 2
magnetosphere × 2
launch × 1
iss × 1
artificial-satellite × 1