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These before and after images depict an encounter by Opportunity's rock abrasion tool with a rock target dubbed "Kalavrita." The circle is about 1.8 inches across.
Early in the mission, scientists plotted a traverse course that would take Spirit up "Husband Hill." The route was chosen so that the rover's solar panels would face the Sun and the antenna would point toward Earth.
reaching the summit
After a long climb, Spirit reached the summit of "Husband Hill" and captured never-before-seen views of the Gusev Crater.