Mars Rovers Probing Water History at Two Sites
NASA's Spirit and Opportunity have been exploring Mars about three times as long as originally scheduled. The more they look, the more evidence of past liquid water on Mars these robots discover. The image above shows the rock dubbed "Escher," which helps support these new findings.
This image, taken by the panoramic camera on NASA's Mars Exploration Rover Spirit during the rover's trek through the "Columbia Hills" at "Gusev Crater," shows the horizontally layered rock dubbed "Tetl." Scientists hope to investigate this rock in more detail, aiming to determine whether the rock's layering is volcanic or sedimentary in origin. If for some reason this particular rock is not favorably positioned for grinding and examination by the toolbox of instruments on the rover's robotic arm, Spirit will be within short reach of another similar rock, dubbed "Coba." more