The "Moessbauer Spectrometer" - Sol 39

Caption NASA originale:"This close-up image of the MER Spirit’s Instrument Deployment Device - or “Arm” - shows the donut-shaped plate on the Moessbauer Spectrometer. This image makes it easy to recognize the imprint left by the instrument in the Martian soil at a location called “Peak” on Sol 43 (February 16, 2004). This image was taken by the Rover’s PanCam on Sol 39 ".