Shield volcano on the rim of Caloris basin

Shield volcano on the rim of Caloris basin
Shield volcano on the rim of Caloris basin A kidney-shaped depression sits in the center of a broad, smooth dome or shield-like feature, interpreted by the MESSENGER science team to be a volcano. The bright halo surrounding the kidney-shaped depression is interpreted to be an explosive volcanic eruption deposit. This feature is distinct in color images from its surroundings and represents compelling evidence for volcanism on Mercury. Courtesy of Science / AAAS