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Does anyone know any Hard Sci Fi books about humans surviving without any hospitable worlds?
(lemmy.dbzer0.com)
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Someone what mentioned Kim Stanley Robinson's Red Mars trilogy, and that is really good, but his book Aurora is almost exactly what you are describing.
Highly recommend.
I was looking for Aurora. I also think it's right on the money. Gets into the weeds with micro ecosystems.
The idea that humans need the diverse micro ecology of earth in order to not become ill over the course of generations is pretty interesting.
Really pretty well-supported by current science, too. I teach chemistry at a community college, so maybe I'm an outlier, but I read a ton of current research about the importance of diversity in "gut biomes" and the damaging effects of monoculture on global ecology, etc.
It seems pretty clear that even if engineers could solve the physical and chemical issues with a generation ship, the limiting constraints are almost certainly going to be biological and ecological, and KS Robinson's estimates for the upper limits seem pretty reasonable based on current knowledge