The rock abrasion tool aboard Spirit cut a 9-millimeter hole in the Clovis rock during the rover's 216th Martian day, August 11, 2004. The hole was at the time the deepest hole ever drilled on Mars.
Brush marks produced by scrubbing the surface of the rock with the abrasion tool's wire brush can be seen as circles on the right side of the image.
January 4, 2013 12:41 PM PST
Photo by: NASA/JPL/Cornell
| Caption by: James Martin
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