14842566   
   From: notreally@best.com   
      
   In the "mission success" panorama   
      
   http://origin.mars5.jpl.nasa.gov/gallery/press/opportunity/20040   
   02a/MSPan_B1_2x-B009R1_br2.jpg   
      
   there is visible a pebble or small stone that has a   
   very unusual shape: it appears to have two "stalks"   
   that protrude upwards (rather like the stalks   
   or antennae of a snail).   
      
   One can see the pebble by scrolling  about 3/5 of the   
   way to the right, and about 3/5 of the way down,   
   in the panorama.   
      
   In the high resolution view, one of the stalks can be   
   seen to be casting a shadow.   
      
   Any idea how a stone with this unusual shape could   
   be formed?  Or could it be some part of the rover   
   airbag that fell off while it was rolling?   
      
   PM   
      
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