This image from the microscopic imager on NASA Mars Exploration Rover Opportunity shows details of the coating on a rock called Chocolate Hills, which the rover found and examined at the edge of a young crater called Concepción.
This image from the microscopic imager on NASA Mars Exploration Rover Opportunity shows details of the coating on a rock called Chocolate Hills, which the rover found and examined at the edge of a young crater called Concepción.