------------------------------------------------------------
参考資料:
・この世界が消えたあとの 科学文明のつくりかた
Lewis Dartnell (著)
・What’s the minimum number of people needed to survive an apocalypse? https://www.livescience.com/minimum-people-to-survive-apocalypse.html
・Computing the Minimal Crew for a multi-generational space journey towards Proxima b
https://arxiv.org/abs/1806.03856
・Minimum Number of Settlers for Survival on Another Planet https://www.nature.com/articles/s41598-020-66740-0