Earlier development of zone refining.
Use sunlight concentrators to progressively melt and freeze a long thread of lead/zinc/silver matte to get the silver out, and discover cadmium, bismuth, tellurium, selenium, etc.
Then you get relatively high efficiency thermoelectic generators just waiting to be discovered.
Not likely and depending on three PODs, but possible.
Use sunlight concentrators to progressively melt and freeze a long thread of lead/zinc/silver matte to get the silver out, and discover cadmium, bismuth, tellurium, selenium, etc.
Then you get relatively high efficiency thermoelectic generators just waiting to be discovered.
Not likely and depending on three PODs, but possible.