NASA—JPL-Caltech / Cornell University

The piece of metal with the American flag on it is made of aluminum recovered from the site of the World Trade Center towers in New York City. It serves as a cable guard for Spirit’s rock abrasion tool as well as a memorial to the victims of the September 11, 2001, terrorist attacks. Opportunity has an identical piece.Image Number: PIA05221Credit: NASA/JPL-Caltech/Cornell University

Rover tracks disappear toward the horizon like the wake of a ship between the craters Endurance and Victoria on the Meridiani Plains. Opportunity took the image while stuck in the sand ripple dubbed Purgatory for over a month. This panorama (only partly shown here) was named Rub Al Khali after the “Empty Quarter” in the Arabian Desert.

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