Rock
NASA Looks Deep Inside Mars
NASA's Mars exploration rover Opportunity is allowing scientists to get a glimpse deep inside Mars
NASA/JPL-Caltech/Cornell
Found on a Martian plain, a dark rock not much bigger than a basketball was the target of interest for Opportunity during the past two months. Dubbed "Marquette Island," the rock is providing a better understanding of the mineral and chemical makeup of the Martian interior.Read More
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