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A Red Cent on a Red Planet: Curiosity’s 1909 Lincoln Penny

Curiosity’s calibration target, imaged with MAHLI on March 9, 2017 (mission sol 1632). Credit: NASA/JPL-Caltech/MSSS.

On March 9, 2017, NASA’s Curiosity rover took this picture with its turret-mounted MAHLI camera of the calibration target installed near the “shoulder” of its robotic arm. In addition to color chips and a metric line graph, the target also includes a U.S. coin: a 1909 Lincoln penny, adhered heads-up.

Curiosity’s coin isn’t just for good luck though; it’s also a nod to geologists who typically use familiar objects in field photos to help determine scale. (Curiosity is, after all, one of only two working robot geologists on all of Mars!)

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