We’ve seen them in dozens of science fiction stories, novels and movies. The generational ships or interstellar arks are (or would be, rather) missions that would travel enormous distances between different planets at a speed lower than that of light. That is, the humans who arrived at the hypothetical destination would be the descendants of the original crew. There are quite a few problems to start with, and the first one is to know how many people would have to put in such a ship without the descendants arriving at …

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