Fact Sheet
Mars Speckles
Tiny rounded rocks look yellow in this false-color image from the Opportunity rover on Mars. Opportunity's instruments are measuring the composition of the small rocks, called "spherules," to help determine their origin. They may have formed in volcanic eruptions, or they may have been rounded by the motion of flowing water. The spherules are sprinkled around an outcrop of bedrock along the rim of the crater in which Opportunity landed. [Credit: NASA/JPL/Cornell]
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