XPost: sci.space.policy   
   From: henry@spsystems.net   
      
   In article ,   
   Gordon D. Pusch  wrote:   
   >As for asteroids, they are believed to be basically porous "rubble piles"   
   >that may be expected to outgas any decay-generated argon as fast as it is   
   >produced.   
      
   No, *some* of them are *possibly* rubble piles.  Some are definitely not;   
   Eros, in particular, appears to be essentially solid rock.  Even for the   
   low-density ones, the matter is not entirely settled -- despite assorted   
   over-enthusiastic press releases -- because there *are* other theories   
   for the low density (e.g., substantial ice content).   
   --   
   MOST launched 30 June; science observations running     |   Henry Spencer   
   since Oct; first surprises seen; papers pending.        | henry@spsystems.net   
      
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