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A new metric called CRASH Clock shows that if satellites in Earth’s orbit stopped maneuvering, the expected time for a collision would be only 3 days, compared to 164 days in 2018. Objects pass within 1 km every 36 seconds in low orbit. With the Sun at peak activity, solar storms can compromise tracking and turn collision prevention into guesswork.
The orbit of Earth is more congested and more vulnerable than at any time in space history. A research team published on arXiv a new metric called CRASH Clock, which stands for Collision Realization And Significant Harm, that measures the expected time for a possible collision in low Earth orbit if satellites, debris, and abandoned rocket bodies stop maneuvering relative to each other. In March 2026, the clock read 3 days, a drastic drop from 5.5 days in June 2025 and 164 days in January 2018. The indicator is moving in the wrong direction, and the Sun at its peak activity can make the situation even more dangerous.
The number is not a prediction that a collision will happen in three days. It is a hypothetical scenario that assumes a severe loss of maneuvering capability and considers only tracked objects in Earth’s orbit, but researchers argue that it illustrates how much modern orbit has become dependent on “error-free operations.” In practice, SpaceX performed 144,404 collision avoidance maneuvers for Starlink between December 2024 and May 2025, and the number of maneuvers has historically doubled every six months. The safety margin in Earth’s orbit exists, but it entirely depends on no one making a mistake.
What the CRASH Clock Reveals About Congestion in Earth’s Orbit
The CRASH Clock functions as a stress indicator for Earth’s orbit, similar to a speedometer that shows not the current speed but the impact speed if the brakes fail. In 2018, the expected time for a collision was 164 days. In June 2025, it fell to 5.5 days. In March 2026, it reached 3 days, a deterioration that reflects the exponential growth in the number of objects in low Earth orbit. With each satellite constellation launched, each abandoned rocket stage, and each fragment of debris that accumulates, the clock ticks faster.
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The approach statistics are equally alarming. Objects pass within less than 1 kilometer in low Earth orbit approximately every 36 seconds, according to an analysis from June 2025. In 2018, the frequency was about 3.9 minutes. In the densest layer, at an altitude of 550 kilometers, where the Starlink constellation operates, approaches of less than 1 kilometer occur every 22 minutes. This is why collision avoidance maneuvers have become routine in Earth’s orbit, even though most people never think about it when using GPS or satellite internet.
Why the Sun at peak activity is a threat to Earth’s orbit
The congestion of Earth’s orbit is a mathematical problem that becomes meteorological when the Sun enters the scene. NASA and NOAA announced in October 2024 that the Sun has reached the maximum phase of its 11-year cycle, when solar eruptions become more frequent and can heat the upper atmosphere, altering the atmospheric drag that satellites experience and changing their trajectories unpredictably.
The solar storm of May 2024 provided a concrete demonstration of the risk. Described by ESA as the largest solar storm to hit Earth in over 20 years, the event caused nearly half of all active satellites in low orbit to perform maneuvers for three days due to increased drag. Now, imagine a storm that also disrupts tracking, communications, and navigation software. Researchers warn that under these conditions, position uncertainties can reach several kilometers, turning collision avoidance into an estimate based on outdated data.
What happens if a collision really occurs in Earth’s orbit
A catastrophic collision in Earth’s orbit does not just mean the loss of a satellite. The impact between two objects at orbital speeds generates a rain of fragments that increases the likelihood of secondary and tertiary collisions, a scenario known as the Kessler syndrome, where each collision produces more debris that causes more collisions in a potentially uncontrolled cascade.
Researchers emphasize that the CRASH Clock does not measure when this cascade would begin, but measures how quickly an initial collision could become possible if there is a loss of control in Earth’s orbit. Parts of low orbit above 600 to 800 kilometers in altitude are already above an “unstable threshold” for the uncontrolled growth of debris in the long term, according to the modeling cited in the study. The short-term impact, however, would be more like pollution than apocalypse: satellites would continue to operate, but under worse conditions and with increasing risk.
The 144 thousand maneuvers that keep Earth’s orbit functioning
The amount of work required to prevent collisions in Earth’s orbit is hard to visualize. SpaceX performed 144,404 Starlink collision avoidance maneuvers in just six months, between December 2024 and May 2025, and the number of maneuvers has historically doubled every semester. Each maneuver consumes fuel, temporarily alters the satellite’s trajectory, and introduces positioning uncertainties that can reach up to 40 kilometers shortly after the movement.
This volume of maneuvers works as long as everything operates as planned. But an intense solar storm, a large-scale communication failure, or a software error affecting an entire constellation of satellites can disrupt the prevention chain, and it is exactly this scenario that the CRASH Clock attempts to quantify. Earth’s orbit functions because thousands of operators around the world continuously coordinate maneuvers. If this coordination fails for three days, the collision ceases to be hypothetical.
What can be done to protect Earth’s orbit
The study frames Earth’s orbit as a shared environment that needs stricter rules. Researchers point to goals such as reducing the deorbiting timeframe for deactivated satellites to five years, stricter standards for sharing orbital data among operators, and treating launch capacity as a budget that needs to be managed, not exploited indefinitely.
The message of the CRASH Clock is that the space community can measure stress before a crisis, not just after. Treating resilience to solar storms as a basic safety measure and investing in tracking redundancy can give Earth’s orbit more time before a systemic failure turns the hypothetical three-day scenario into reality. Your cell phone’s GPS, satellite internet, and weather forecasting depend on an orbit that functions perfectly. And perfectly, at this moment, means diverting from something that could destroy everything every 36 seconds.
Earth’s orbit is three days away from a collision if satellites stop maneuvering, and the Sun could be the trigger. Did you know that SpaceX makes 144,000 maneuvers per semester? Does that concern you? Share your thoughts in the comments.
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