XPost: sci.physics   
   From: lrobinson54@insightbb.com   
      
   Personally, I was thinking from the NASA Ames Summer Study 1975, wherein the   
   participants were charged to build a permament Space City. This can   
   correlate to building the initial Martian, or Lunar, Settlement.   
      
   One of the problems The Summer Study faced was the issue of Radiation in the   
   Colony Station. The participants solved it through use of a six feet thick   
   shield, consisting of lunar regolith, between the double hulls. A reduced   
   version could be used in the interplanetary spacecraft. Unfortunately, the   
   regolith is deadweight mass, and requires fuel to transport it between Earth   
   and Mars (as well as vice versa).   
      
   Comments?   
      
   --   
   Leonard C Robinson   
   "The Historian Remembers, and speculates on what might have been.   
   "The Visionary Remembers, and speculates on what may yet be."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)