From: henry@spsystems.net   
      
   In article <20040111221623.15336.00003226@mb-m04.aol.com>,   
   MSu1049321  wrote:   
   >...I thought on Sojourner, they   
   >put inside little sealed plutonium or uranium capsules as solid-state heaters,   
   >like mini RTG's withoutmhe power connections, ust to serve as 'hot water   
   >bottles" to keep the insides warm overnight... zat true?   
      
   Yep.  They're called RHUs, Radioisotope Heating Units.  They use Pu-238,   
   just like RTGs although in rather smaller quantities.  The one snag is   
   that you can't turn them on and off, so you have to go easy with them to   
   avoid overheating.   
      
   >And are any of these in MER 1 and 2?   
      
   Yes.   
   --   
   MOST launched 30 June; science observations running     |   Henry Spencer   
   since Oct; first surprises seen; papers pending.        | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)