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mass-fraction × 29launch × 4
rockets × 4
delta-v × 4
rocket-equation × 4
specific-impulse × 4
mass × 3
tanks × 3
spacex × 2
falcon-9 × 2
propulsion × 2
low-earth-orbit × 2
spacex-starship × 2
deep-space × 2
engineering × 2
shuttle-derived × 2
the-moon × 1
space-shuttle × 1
history × 1
fuel × 1
design × 1
mission-design × 1
interplanetary × 1
liquid-fuel × 1
materials × 1