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antimatter × 15propulsion × 5
advanced-propulsion × 5
rockets × 4
design-alternative × 2
interstellar-travel × 2
spacecraft × 1
engine-design × 1
gravity × 1
identify-this-object × 1
radiation × 1
power × 1
magnetic-field × 1
nuclear × 1
time × 1
thermal-control × 1
exhaust × 1
isru × 1
solar-wind × 1
ftl × 1