Opportunity at El Capitan

NASA's Mars Exploration Rover Opportunity casts a shadow over the El Capitan area that the rover is examining with tools on its robotic arm. Opportunity took this image with its front hazard-avoidance camera on Feb. 23, 2004, during the rover's 29th martian day, or sol. Opportunity used its rock abrasion tool to grind a small hole into Opportunity Ledge later on sol 29 to prepare for using the other tools on its arm to analyze the freshly exposed rock during subsequent sols.