If this is interesting to folks, I highly recommend "Mining the Sky": http://www.amazon.com/Mining-Sky-Untold-Asteroids-Planets/dp/0201328194 http://www.amazon.

If this is interesting to folks, I highly recommend "Mining the Sky": http://www.amazon.com/Mining-Sky-Untold-Asteroids-Planets/dp/0201328194 http://www.amazon.com/Mining-Sky-Untold-Asteroids-Planets/dp....