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Spirit Beholds Bumpy Boulder. As the Mars Exploration Rover Spirit began collecting images for a 360-degree panorama of new terrain, the rover captured this view of a dark boulder with an interesting surface texture. The boulder is about 40 centimeters (16 inches) tall on Martian sand about 5 meters (16 feet) away from Spirit. It is one of many dark, volcanic rock fragments -- many pocked with rounded holes called vesicles -- littering the slope of Low Ridge. The rock surface facing the rover is similar in appearance to the surface texture on the outside of lava flows on Earth.
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