Space Surveillance Network (SSN)

The Space Surveillance Network (SSN) is a global system of ground-based radar and optical sensors that track objects in Earth's orbit, including satellites and space debris. Its primary purpose is to monitor the movement and position of these objects to prevent potential collisions, support satellite operations, and maintain space safety. Managed mainly by the U.S. Space Force, the SSN provides real-time data to ensure the secure and sustainable use of space assets, playing a critical role in space situational awareness and national security.