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Old 08-01-2018, 11:46 PM   #31
AlexanderHowl
 
Join Date: Feb 2016
Default Re: Very Large Spacecraft

When it comes to spacecraft (as opposed to space colonies), I generally assume that the breakdown for full life support is 50% public space, 25% life support systems, and 25% personal space and the breakdown for total life support is 50% growing systems, 25% public space, 12.5% life support systems, and 12.5% personal space. In very large spacecraft, like the Galactic Defender, the combined volume of the growing systems will take up 200,000 cubic kilometers of volume.

With a total volume of 200 trillion cubic meters, assuming that 25% is public spaces and 25% is support systems, there result is 100 trillion cubic meters of growing volume for 600 billion people, or 167 cubic meters per person, which is more than enough for aquaponics. Vegetarians only need 40 cubic meters, but meat eaters will need 160 cubic meters to allow for 20% of their nutrition to come from aquatic sources.
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