This image taken by Opportunity shows a target dubbed “Campbell” on a rock called “MacKenzie” in “Endurance Crater”. Opportunity dug a hole into the target with its rock abrasion tool, then captured this picture with its microscopic imager on sol 184 (July 30, 2004). The image mosaic is about 6 centimeters (2.4 inches) across. (Photo by NASA/JPL/Cornell/USGS via The Atlantic)
