Trail of 'Rat' Holes
July 25, 2004
NASA's Mars Exploration Rover Opportunity's rock abrasion tool, known informally as the Rat, has nibbled seven holes into the slope of Endurance Crater. This image from the rover's navigation camera was released previously (PIA06716) without the Rat holes labeled so that viewers could try to find the holes themselves. Here, the holes have been identified. Starting from the uppermost pictured (closest to the crater rim) to the lowest, the Rat hole targets are: Tennessee, Cobblehill, Virginia, London, Grindstone, Kettlestone, and Drammensfjorden. These holes were drilled on sols 138 (June 13, 2004), 143 (June 18), 145 (June 20), 148 (June 23), 151 (June 26), 153 (June 28) and 161 (July 7), respectively. Each hole is 4.5 centimeters (1.8 inches) in diameter.