NASA's Mars Exploration Rover Opportunity shows the imprint of the donut-shaped plate on the rover's Moessbauer spectrometer instrument, located on rover's the 'arm.' The rover was investigating fine-grained soil for iron-bearing minerals.

This image was taken by the microscopic imager, an instrument located on the Mars Exploration Rover Opportunity's instrument deployment device, or "arm." The image shows the imprint of the donut-shaped plate on the rover's Moessbauer spectrometer instrument, also located on the "arm." The Moessbauer spectrometer was deployed within the trench to investigate the fine-grained soil for iron-bearing minerals. The area in this image measures approximately 3 centimeters (1.2 inches) across.

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