Digu Ring Mountain is one of the most observed Ring Mountains, with a diameter of about 85 kilometers and a depth of about 4850 meters. At the bottom of the crater there are complex central peaks, up to 1600 meters. The Tycho Ring is 51 miles (82 kilometers) in diameter, visible to the naked eye on Earth, but in fact it is the target of many astronomers. In 1968, the U.S. "Surveyor" 7 lunar probe captured some radiation patterns in the Tycho Ring Mountain. There are 12 radiation patterns in the Tycho Ring Mountains. They pass through mountains, moon valleys and the Moon Sea. The longest one is 1800 kilometers long and the widest one is 20 kilometers wide. Most scientists believe that rocks and rock powders are thrown around when volcanic eruptions or large meteorites strike the surface of the moon. Later, these substances gradually fell back to the moon and became radiation lines. Because of their high albedo, they look particularly bright.