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> What resources are so scarce that it would pay to mine them in space ? Helium-3 http://www.popularmechanics.com/science/space/moon-mars/1283056 http://www.po

• anthonyb 14y ago
  Also all of the rare earth minerals, like Platinum, Palladium, Tantalum, Niobium, etc. Useful for other high tech endeavours like fuel cells, capacitors, solar cells. Energy via solar satellites might also be possible, if the mechanism to transmit power from space can be figured out.