(Note the holes in the rear wheel --- that's a vanity detail created by the Jet Propulsion Laboratory, which built the rover: As the wheels roll across the Martian dust, the holes leave morse-code imprints that spell out "JPL...JPL...JPL" endlessly. The tracks will likely outlast JPL itself. :) http://www.jpl.nasa.gov/news/news.php?release=2012-266 )
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