Hmm...what would be the minimum size of a closed ecosystem enough to support one human indefinitely? Assume an energy source exists.
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I think the earth is probably within an order of magnitude of the minimum size in mass. And maybe within 2x.
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question is would that fulfill vitamin and protein requirements. Also, define "energy source"
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imagine artificial sunlight possible... maybe nuke electricity powering lamps, electro discharge, heat...
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Timescales I associate with parts of closed ecosystems are much longer than human lifetime.
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Are there any food sources without photosynthesis at their root? No. So we need space large enough to support plant life cycle.
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