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materials × 144spacex × 11
mars × 10
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design × 9
physics × 9
heat-shield × 9
space-shuttle × 8
spacecraft × 8
technology × 8
space-elevator × 8
construction × 8
rockets × 7
spacesuits × 7
radiation × 7
engineering × 7
thermal × 7
vacuum × 7
composite-materials × 7
reentry × 6
chemistry × 6
the-moon × 5
apollo-program × 5
engine-design × 5
solar-sail × 5
