XPost: sci.space.policy   
   From: henry@spsystems.net   
      
   In article ,   
   Josh Gigantino  wrote:   
   >Is there any known or guessed quantity of He3 on asteroids or dead   
   >comets? If an object has been orbitting for 4+ billion years, it   
   >should have collected some from the solar wind.   
      
   The big uncertainty is that we know essentially nothing about the depth   
   and age of the regolith on asteroids.   
      
   Yeah, there'd probably be some, but whether it's worth exploiting is   
   another question.   
      
   >...If there was a supply, collecting and   
   >separating He3 could be much simpler in the micro-G environment.   
      
   Or not, as the case may be.  Handling fine powders may well be easier   
   in gravity.   
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