From: lwcamp@gmail.com   
      
   We have discovered a number of "super-earth" planets already, with masses   
   between that of Earth and Neptune/Uranus.  The details are not yet known, but   
   they might have very thick (possibly helium rich) atmospheres.   
      
   Carbon planets have been speculated by people who actually know about solar   
   system formation, which are rich in carbon and deficient in oxygen.  They   
   would have mantles of silicon carbide or titanium carbide, with crusts made of   
   diamond and graphite,    
   oceans of hydrocarbons, and atmospheres of carbon monoxide and light   
   hydrocarbons (methane, ethane).   
      
   Ice planets are possible, where the world is covered by oceans so deep that   
   the pressure crystallizes the deep water into exotic forms of ice.  This would   
   cut off the oceans from the geological activity in the crust and mantle,   
   probably leading to    
   nutrient deficient and lifeless oceans.   
      
   Luke   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)