Earth's Satellites Could Collapse in Just Days After Single Catastrophic Event

The Ticking CRASH Clock

Scientists have created a simple warning system called the CRASH Clock that answers a basic question: If satellites suddenly couldn't steer around one another, how much time would elapse before there was a crash in orbit? Their current answer: 5.5 days. This alarming metric represents how quickly our orbital infrastructure could unravel if satellite operators lost the ability to maneuver their spacecraft.

In less than a decade, the clock went from five-and-a-half months to just five-and-a-half days, a chilling increase in danger. The team's research measures how quickly a catastrophic collision could occur if satellite operators lost the ability to maneuver—whether due to a solar storm, a software failure, or some other catastrophic failure. What makes this particularly concerning is that calculations show that, across all Low-Earth Orbit mega-constellations, a "close approach", defined as two satellites passing by each at less than 1km separation, occurs every 22 seconds. For Starlink alone, that number is once every 11 minutes.

The CRASH Clock assumes no maneuvers can happen—a worst-case scenario where some catastrophic event like a solar storm has occurred. A zero value would mean if you lose maneuvering capabilities, you're likely to have a collision right away. Perhaps even more disturbingly, if operators lose control for even just 24 hours, there's a 30% chance of a catastrophic collision that could act as the seed case for the decades-long process of Kessler syndrome.

The Solar Storm Threat

The risk for collision within the first few days of a solar storm is a lot higher than under normal operating conditions. Even if you can still communicate with your satellite, there's so much uncertainty in your positions when everything is moving because of atmospheric drag. When you have high density of objects, it makes the likelihood of collision a lot more prominent.

Historical precedent makes this threat very real. On May 19, 1998, the Galaxy IV communications satellite failed following a period of intense solar flares. The loss of the satellite disabled 80–90% of all the pagers on the North American continent. The 2024 Gannon storm was the strongest in decades, but we already know of a stronger one - the Carrington Event of 1859. That was the strongest solar storm on record, and if a similar event happened today it would wipe out our ability to control our satellites for much longer than 3 days.

Unfortunately, solar storms don't come with much warning - maybe only a day or two at most. And even when they do, we can't necessarily do anything about them other than trying to safeguard the satellites they could effect. But the dynamic environment they introduce into the atmosphere necessitates real-time feedback and control to effectively manage those satellites.

The Kessler Syndrome Cascade

In 1978, NASA researcher Donald Kessler published a paper in the Journal of Geophysical Research, warning of the rising risk of satellites colliding with one another and creating a belt of debris around the Earth that would block our access to space. This in turn gave rise to the term "Kessler Syndrome," a vaguely-defined scenario wherein low Earth orbit becomes so overcrowded with satellites that one single collision would trigger another and another and so on.

The fragments can then hit other objects, producing even more space debris: if a large enough collision or explosion were to occur, such as between a space station and a defunct satellite, or as the result of hostile actions in space, then the resulting debris cascade could make prospects for long-term viability of satellites in particular low Earth orbits extremely low. According to the National Academy of Sciences: A 1 kg object impacting at 10 km/s, for example, is probably capable of catastrophically breaking up a 1,000 kg spacecraft if it strikes a high-density element in the spacecraft.

There are over 15,000 satellites in orbit right now, and a loss of control or a collision could bring all of them down like a house of cards. There are certain altitudes where we've already passed the threshold for the Kessler syndrome. For instance, at 775 km altitude, as well as at 840 km and 975 km, the collision risk is scaling up rapidly.

Consequences for Modern Life

Television broadcasts, navigation systems, weather forecasts, and numerous forms of financial exchanges all rely on satellites to work. If all of Earth's satellites suddenly shut down, international communications systems would begin to fail, transportation would grind to a halt, clocks would fall out of sync, and global supply chains would collapse.

The phenomenon could potentially result in widespread service outages affecting telecommunication and internet services. Navigation systems, fundamentally reliant on the satellite-based Global Positioning System (GPS), would also face serious challenges in such a scenario. This could have an impact on everything from personal navigation to aviation logistics. The domino effect