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rat_01.jpg

Simulated image of the RAT on the arm of the rover as it grinds a rock target.

In order to look at the interior of rocks, a field geologist on Earth uses a rock hammer. On the Athena payload, the job of a rock hammer is done by the RAT -- the Rock Abrasion Tool. The RAT is positioned against a rock by the rover's instrument arm, and uses a grinding wheel to remove dust and weathered rock, exposing fresh rock underneath. The RAT exposes an area nearly 5 cm (2 inches) in diameter, and grinds down to a depth of about 5 mm (0.2 inches).

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