Quote:
Originally Posted by ericthered
On ark size, a few details:
Issac Arthur, a futurist I like to follow, likes to use the number of 2 square miles of floor supports 5000 people with intensive hydroponics
If we want only 10% of the habitats inhabited by the initial popultion, we need 5 million square miles, which will weigh about 1.5*10^16 tons.
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I fiddled around with ericbsmith's GURPS Spaceships spreadsheet a bit to figure out spaceship size, and it ended up being way smaller than I expected. For 1 billion passengers, I think it was SM+24 or something, only 10 miles long, for the population of China. I wasn't sure what to do with that though, so left it there.