United States Space Surveillance Network (SSN)

The United States Space Surveillance Network (SSN) is a system of ground-based radar and optical sensors that tracks objects orbiting Earth, including satellites and space debris. Managed by the U.S. Space Force, it provides critical data on the location, movement, and size of these objects to prevent collisions and support space operations. The SSN helps ensure the safety and sustainability of space activities by maintaining a comprehensive catalog of man-made objects in Earth's orbit.