SpaceX’s ambitious plan to blanket the globe with internet coverage through its Starlink satellite network has hit an unexpected and powerful obstacle: the Sun. Recent solar storms, triggered by intense solar activity, are causing low-Earth orbit Starlink satellites to fail at alarming rates. As solar activity ramps up during the current solar cycle, the situation is becoming a serious challenge for satellite operators—and SpaceX is feeling the impact firsthand.
In one particularly damaging event, SpaceX lost nearly 40 Starlink satellites shortly after launch. These satellites, placed in low Earth orbit to begin their initial orbital maneuvers, were hit by a geomagnetic storm caused by a burst of solar energy known as a coronal mass ejection (CME). The sudden surge in solar particles disturbed Earth’s magnetic field and significantly increased atmospheric drag at the altitudes where the satellites were operating.
Normally, newly launched Starlink satellites spend days raising their orbits using onboard propulsion systems. But in this case, the increase in atmospheric density was too much. The drag was so intense that the satellites could not maintain altitude. Despite SpaceX’s efforts to tilt the satellites into a more aerodynamic position—reducing resistance—they were unable to recover. As a result, they reentered Earth’s atmosphere and burned up.
Fortunately, the satellites are designed to disintegrate completely upon reentry, meaning they pose no risk to people on the ground or to other objects in orbit. Still, the loss is a sobering reminder of the vulnerabilities satellite operators face from space weather. It also highlights the unique risks that come with operating in low Earth orbit, where atmospheric drag—even under normal conditions—is a factor. When the Sun becomes more active, that drag can become a satellite killer.
This is particularly concerning given that the Sun is entering the peak of its 11-year solar cycle, a period when solar flares, CMEs, and geomagnetic storms become much more frequent and intense. Solar Cycle 25, as it’s known, is expected to peak around 2025, meaning the next couple of years could bring even more solar storms—and potentially more satellite failures.
For SpaceX, which plans to deploy tens of thousands of Starlink satellites to provide global broadband service, the stakes are high. The company’s low-altitude strategy offers advantages in terms of speed and latency, but also places its satellites closer to the part of Earth’s atmosphere most affected by solar storms.
The Starlink network is built for resilience, with satellites designed to be replaced frequently and cheaply. However, unexpected mass losses like these introduce costly delays and raise concerns about sustainability, especially as more companies and nations race to populate low Earth orbit with their own constellations.
SpaceX is reportedly making adjustments to better prepare for these kinds of space weather events. This includes re-evaluating satellite deployment altitudes, increasing responsiveness to space weather forecasts, and improving propulsion systems for quicker orbit-raising maneuvers after launch. Additionally, engineers are exploring ways to harden future satellites against sudden spikes in atmospheric drag.
But the challenge isn’t just technical. It also underscores a broader need for improved space weather forecasting and real-time monitoring. While agencies like NASA and NOAA track solar activity, forecasting geomagnetic storms remains an imprecise science. Better predictive tools would help satellite operators prepare and potentially delay launches or adjust orbital plans to avoid solar damage.
As SpaceX continues to expand the Starlink network, the company must now contend with an invisible but powerful adversary: the Sun. The recent satellite losses serve as a wake-up call, not just for SpaceX, but for the entire satellite industry. In the age of megaconstellations, space weather is no longer a fringe concern—it’s a frontline threat.
