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First Grinding
The round, shallow depression in this image
resulted from history's first grinding of a rock on Mars. The rock
abrasion tool on NASA's Spirit rover ground off the surface of a
patch 45.5 millimeters (1.8 inches) in diameter on a rock called
Adirondack. The hole is 2.65 millimeters (0.1 inch) deep, exposing
fresh interior material of the rock for close inspection with the
rover's microscopic imager and two spectrometers on the robotic arm.
From: NASA/JPL
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