Ground-Base Electro-Optical Deep Space Surveillance

The Ground-Base Electro-Optical Deep Space Surveillance (GEODSS) is a US Space Force organization/initiative to track artificial satellites and other spacecraft, including abandoned equipment such as rocket stages left in orbit, i.e., space junk. It monitors a shell-shaped region surrounding Earth beginning about 3000 miles above the surface, and extending beyond geosynchronous orbit distance. It operates telescopes at three sites.