XPost: sci.astro   
   From: Rodneykelp605@hotmail.com   
      
   That might cause pools of liquid nitrogen mighten it?   
      
   "John Popelish"  wrote in message   
   news:41F05D4B.858A7442@rica.net...   
   > Rodney Kelp wrote:   
   >>   
   >> How do you get a nitrogen atmosphere from a moon that has methane oceans?   
   >   
   > It is so cold that the methane does not have a very high vapor   
   > pressure, so the atmosphere can keep only a little mixed in as vapor   
   > before it rains out.  Nitrogen is left.  If it was a bit colder, that   
   > would rain out, too.   
   >   
   > --   
   > John Popelish   
      
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