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transport × 27mars × 5
rockets × 3
the-moon × 3
space-shuttle × 3
colonization × 3
spacex × 2
launch × 2
falcon-9 × 2
history × 2
propulsion × 2
landing × 2
rovers × 2
design-alternative × 2
technology × 2
low-energy-transfer × 2
shuttle-carrier-aircraft × 2
orbital-mechanics × 1
nasa × 1
apollo-program × 1
fuel × 1
low-earth-orbit × 1
atmosphere × 1
trajectory × 1
spacex-starship × 1