This approximately true-color view of a rock called "Tetl" was made from frames taken by Spirit's panoramic camera on Sept. 29. Spirit used a microscopic imager to inspect the region indicated as MI.
The two Mars Rovers, Opportunity and Sprit, are showing signs of wear... not surprising, since their mission was expected to end in April. But they're still beaming signals to Earth. NPR's Joe Palca reports.