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Astrophil
2004-Jun-02, 12:48 PM
Anyone got any thoughts about the bright horseshoe marking, apparently around 1cm long, in

http://qt.exploratorium.edu/mars/opportunity/pancam/2004-06-01/1P139113408EFF2811P2535L2M1.JPG

and a set of subsequent images?

ToSeek
2004-Jun-02, 12:57 PM
That's the mark left by one of the science instruments on the robotic arm.

EDIT:

Previous examples:

http://marsrovers.jpl.nasa.gov/gallery/all/2/p/065/2P132133878ESF1500P2534R3M1.HTML

http://marsrovers.jpl.nasa.gov/gallery/all/2/m/065/2M132132632EFF1500P2958M2M1.HTML

See this discussion. (http://www.badastronomy.com/phpBB/viewtopic.php?t=11893) It's the imprint of the Mossbauer sensor head.