Hmm...what would be the minimum size of a closed ecosystem enough to support one human indefinitely? Assume an energy source exists.
@leecockrell imagine artificial sunlight possible... maybe nuke electricity powering lamps, electro discharge, heat...
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@vgr 4000 sq feet, rotating crops seems like it would fulfill calorie and O2. On a long term space voyage, efficiency of recycling looms.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@vgr 99% efficiency/year recycling trace vitamins and minerals works for 10 years but not 10,000.Thanks. Twitter will use this to make your timeline better. UndoUndo
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