This cylindrical-projection mosaic was created from three navigation camera frames that NASA's Mars Exploration Rover Opportunity acquired at about 4:05 p.m., local solar time on Mars, on sol 108, May 13, 2004. Opportunity is sitting along the rim of "Endurance Crater." NASA has not yet determined whether Opportunity will venture inside the crater, which is about 130 meters (about 430 feet) in diameter.