ISLAMABAD, July 14 — For millions of people around the world, the ability to make a phone call, watch live television, or check the weather forecast depends on a band of space 35,786 kilometres above the equator. This is geosynchronous orbit, or GEO, and it remains one of the most valuable pieces of real estate in the solar system. A satellite in GEO circles the Earth at the same speed the planet rotates, meaning it stays fixed over a single point on the equator.
This unique property has made GEO indispensable for communications, weather monitoring, and surveillance for decades. The first satellite to achieve this was Syncom 3, launched by NASA in 1964.
As of 2023, more than 560 satellites operate in GEO. Among the major fleet operators are Intelsat, founded in 1964, and SES, founded in 1985. The U.S. military also relies heavily on the Wideband Global SATCOM, or WGS, system.
These satellites typically have a lifespan of 15 to 20 years. The economic stakes are enormous.
Launch costs for a single GEO satellite can reach $300 million. The orbital slots themselves are a finite resource — just 360 degrees of longitude — and are allocated by the International Telecommunication Union, an agency of the United Nations, under the 1976 Bogotá Declaration and subsequent ITU Radio Regulations. The altitude that makes GEO so useful also comes with a significant risk.
The orbit lies beyond the protection of Earth’s magnetic field, exposing satellites to solar radiation and geomagnetic storms. This is a concern that satellite operators and insurers watch closely. To keep track of the growing traffic, the U.S. Space Force operates the Space Fence radar system, which became operational in 2020 and is designed to track objects in GEO.
For patients and families who rely on telemedicine or satellite-based emergency communications, the reliability of these systems is not abstract. When a satellite in GEO reaches the end of its 15- to 20-year lifespan, or is knocked out by a solar storm, the consequences can be felt on the ground.
The encouraging part is that the international framework for managing GEO, while complex, has kept the orbit functioning for decades. The ITU’s role in allocating slots has prevented the kind of congestion that might otherwise make the orbit unusable. Still, patients and anyone who depends on satellite services should talk to their doctor or service provider about backup plans for communications.
As more satellites are launched and the orbital slots fill up, the conversation about how to keep GEO safe and sustainable will only grow more urgent.
