Thousands of stars and the planet Venus shine over Crater Lake in Oregon just before sunrise. The planet Venus is the brightest object in the sky and is visible near the center of the image and reflected in the lake. Crater Lake, which is actually a caldera, formed when Mount Mazama erupted violently about 7,700 years ago, causing its summit to collapse. Subsequent eruptions sealed the caldera, trapping rain water and snowmelt, forming the lake, which has a maximum depth of 1,949 feet (594 meters). Wizard Island, a volcanic cinder code, is visible in the foreground.