A recent global survey has revealed that Starlink satellites are creating major problems for scientists trying to study space through radio waves.
Largest Satellite Radio Survey Reveals Interference
This discovery comes after researchers from Curtin University undertook the world’s largest study of low-frequency satellite radio emissions. Their work shows that satellites operated by Starlink, which is part of a satellite internet project, are interfering with signals used in space research.
Using a prototype station for the Square Kilometre Array (SKA)—a massive radio telescope currently being built—scientists collected and studied 76 million images of the sky. These images were meant to help in understanding how stars form, how galaxies evolve, and what the universe is made of. However, during this work, researchers found that over 112,000 unwanted radio signals were detected. These signals came from 1,806 Starlink satellites.
Starlink is a network of satellites designed to provide internet to remote areas around the world. During the study period of just four months, Starlink launched 477 new satellites. That’s more than any other satellite group, and it adds up to a total of over 7,000 Starlink satellites in orbit at the time of the study.
What makes this problem serious is the kind of signals the satellites give off. These are not planned signals, like those sent for internet services. Instead, they are stray signals, possibly leaking from the electronics inside the satellites. These signals are not only hard to predict, but they also show up in areas of the frequency range that are supposed to be protected for science. Some of the signals were found at 150.8 MHz, a frequency where no satellite signals should appear at all. In some cases, up to 30% of the sky images were affected by interference.
Unintended Signals Are Drowning Out Cosmic Data
The problem is not just about how many satellites are in the sky, but also about how strong their unintended signals are and where they appear on the radio spectrum. These “leaked” signals can block the faint and natural radio waves coming from stars, galaxies, and other cosmic objects. Radio astronomers rely on those faint signals to learn more about the universe. When strong satellite emissions interfere, the research becomes harder or even impossible.
The signals found during the survey are particularly troubling because they appear in protected bands. These are parts of the radio spectrum that are set aside for scientific use only. When satellites give off signals in these bands, it can cause data to be lost or damaged. Scientists can’t just filter these signals out easily because they don’t follow any predictable pattern.
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This challenge is expected to grow as more and more satellites are launched. While Starlink is currently the largest satellite group in orbit, other companies are planning similar networks. The growing number of satellites means the sky is becoming more crowded, increasing the chances of interference with important scientific observations.
The regulations that govern satellite emissions mainly cover planned or “intentional” transmissions. But the emissions found in this survey are unintended, and current rules do not fully address them. This means the satellite companies are not breaking any existing laws, even though their satellites are affecting radio astronomy.
A Delicate Balance Between Science and Technology
The study brings attention to the need for balance between two very important things: satellite technology and space science. Satellite-based internet has helped millions of people connect online, especially in places where normal internet access is hard to get. At the same time, radio astronomy is a vital part of discovering how the universe works. Both fields offer huge benefits, but one should not cancel out the other.
This situation shows the importance of finding ways to reduce the impact of satellites on radio astronomy. Although Starlink and other networks are not doing anything wrong under current international rules, the emissions from their satellites are showing up more often in data collected by astronomers.
Scientists are calling for better awareness of this issue so that policies can be updated to handle the new reality of thousands of satellites, including Starlink, in orbit. It is crucial to understand the scope of the problem, and this study provides the most detailed picture so far. It is the first time such a large number of Starlink satellite signals have been recorded and analysed at low frequencies.
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With the Square Kilometre Array on the way to becoming the world’s largest and most powerful radio telescope, keeping the skies clean of interference from networks like Starlink is more important than ever. The SKA is being built to answer some of the biggest questions in science, but its success depends on having a quiet environment for radio signals.
As the number of satellites, especially from mega-constellations such as Starlink, continues to grow, the need to manage unintended interference becomes even more urgent. The survey from Curtin University shows just how big this challenge is becoming and highlights the importance of cooperation between technology companies like Starlink and the scientific community.
