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fuels × 63science-based × 26
energy × 11
space-travel × 8
internal-consistency × 8
spaceships × 7
post-apocalypse × 7
vehicles × 7
warfare × 4
science-fiction × 3
hard-science × 3
geology × 3
chemistry × 3
engineering × 3
rockets × 3
creature-design × 2
physics × 2
evolution × 2
space × 2
aliens × 2
environment × 2
materials × 2
construction × 2
military-defense × 2
fire × 2