Marty, 

 That's a practical explanation.  But I'm not sure that completely describes 
the picture we've seen on Mars.
 

---In FairfieldLife@yahoogroups.com, <martyboi@...> wrote :

 The image was taken with a microscopic camera on the rover. It's actually very 
tiny. 

  Most likely it is the impression of a Phillips Screw Head that touched the 
surface dust as the camera's arm moved into position.



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