XPost: sci.space.policy   
   From: g_d_pusch_remove_underscores@xnet.com   
   Copy: jpowell180@charter.net   
      
   "Joseph S. Powell, III"  writes:   
      
   > That's why a polar base would be more desirable - the lunar polar ice   
   > hypothesis was finally confirmed by observations made by the Lunar   
   > Prospector spacecraft in 1998.   
      
   Correction: All that has been established is that _SOME_ sort   
   of hydrogen-containing substance exists near the polar regions.   
   The physical nature and chemical composition of said hydrogen-   
   containing substance remains a matter of speculation. Water   
   is _one_ possibility --- but ammonia is _also_ a possibility,   
   as are carbonaceous chondritic matter or tar-like "tholins."   
   We won't know for sure until something capable of measuring   
   the actual composition and not just the hydrogen content   
   is launched.   
      
      
   -- Gordon D. Pusch   
      
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