Multigeneration Worldship Population Requirements Similar to Battlestar Galactica
Gardner-O’Kearny calculated each population’s possible trajectory over 300 years, or 30 generations. Because there are a lot of random variables to consider, he calculated the trajectory of each population 10 times, then averaged the results. (With one exception: The starting population of 40,000 is so large that it takes 18 hours to complete each simulation, so he calculated that trajectory only once.)
Genetic diversity keeps groups healthy, and larger populations tend to have more diversity.
When 10,000 people are housed in one starship, there’s a potential for a giant catastrophe to wipe out almost everyone onboard. But when 10,000 people are spread out over five ships of 2000 apiece, the damage is limited.
The revised Battlestar Galactica television show had survivors in the range of 50,000 and dropping to about 38000. The show was inferior in terms of the ending and plot but they did have the right numbers to maintain long term genetic diversity.
Source: http://nextbigfuture.com/2014/04/multigeneration-worldship-population.html
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