Some of the larger craters on the Moon have central peaks. Central peaks are thought to be due to rebound from stresses released after crater formation. Tsiolkovsky, the lunar far-side crater shown here, is 115miles (185km) in diameter. Basaltic lava has flooded the crater's floor giving it a dark smooth appearance. Material from landslides can be seen around the edge of the floor. (Apollo 15 Metric camera stereo photo AS 15-M3-2798 & 2799, orbit 74)