From: chosp@cox.net   
      
   "Brian C"  wrote in message   
   news:123b51f7.0402280828.3ba63463@posting.google.com...   
   > See half donut shaped feature on Sol 54 Spirit microscope images   
   >   
   > Has anyone any ideas what this feature is - looks like nothing I've   
   > ever seen - looks as thogh it's a tube like structure with a piece of   
   > wall broken away - is this a result of RAT activity or are we seeing   
   > an unatered feature ?   
      
   It is the partial imprint of the Mossbaur Spectrometer.   
   The top half has been compressed flat. Due to the   
   uneven nature of the soil or the angle of the arm   
   or both the imprint is not completely circular.   
   The Sol 54 Spirit microscopic images page contains   
   before and after pics of the same spot.   
   The Sols 43, 49 & 50 Spirit microscopic images   
   and Opportunity Sol 12s,17 & 26 microscopic   
   images all show the same type of  deformation   
   on other surfaces - also from the Mossbaur   
   Spectrometer.   
   http://marsrovers.nasa.gov/gallery/all/spirit.html   
   http://marsrovers.nasa.gov/gallery/all/opportunity.html   
   http://marsrovers.nasa.gov/mission/spacecraft_instru_mossbr.html   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)