XPost: sci.space.policy   
   From: g_d_pusch_remove_underscores@xnet.com   
   Copy: wallacethinmintr@eircom.net   
      
   wallacethinmintr@eircom.net (Russell Wallace) writes:   
      
   > On 29 Jan 2004 15:27:59 -0800, alexterrell@yahoo.com (Alex Terrell)   
   > wrote:   
   >   
   >> Carbon is abundant in many NEOs. Nitrogen is a problem, but not a   
   >> major problem until we move from Torus colonies to Cylinder colonies   
   >> with their large volumes. Until then, a Heavy Lift Vehicle delivering   
   >> NH3 is enough.   
   >   
   > As far as air-filler goes, wouldn't argon be an adequate substitute   
   > for nitrogen? I've a feeling the moon and asteroids ought to contain   
   > argon. (Someone correct me if I'm wrong.)   
      
   Why would you have that feeling?  Argon is an inert gas, so it doesn't bond   
   to anything (well, except for fluorine and chlorine, under contrived laboratory   
   conditions), and its melting point is not that much higher than nitrogen's.   
   You won't find frozen argon lying around until you're almost out to Neptune...   
      
      
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