"A Growing Concern: Elon Musk’s Starlink Satellites Could Disrupt Radio Telescopes"

New Starlink satellites are emitting 30 times more unintended radio waves than earlier models.

More than half of the operational satellites currently orbiting the Earth belong to SpaceX’s Starlink constellation, which has raised concerns among astronomers. These satellites often leave visible streaks in long-exposure photographs and, according to a new study, are also emitting unintended radio signals that interfere with observations by ground-based radio telescopes.

Using data from the Low Frequency Array (LOFAR) radio telescope in the Netherlands, researchers discovered that SpaceX’s second-generation Starlink satellites, launched since last year, emit significantly more radio waves than earlier versions. The emissions, which are up to 30 times stronger, are at lower frequencies than those used for Starlink’s communication services, leading scientists to believe the signals are unintentional. Despite this, the leakage is 10 million times stronger than the faint astronomical signals that LOFAR and similar radio telescopes are designed to observe.

For radio astronomers, these emissions are extremely disruptive. Lead author Cees Bassa, from the Netherlands Institute for Radio Astronomy, compared the challenge to trying to spot a faint star next to a full Moon. As more Starlink satellites are launched, the interference is expected to worsen. Currently, more than 6,000 Starlinks are in orbit, and SpaceX plans to expand this number to tens of thousands. If this continues, it could become impossible for large-scale telescopes like LOFAR to observe any part of the sky without encountering interference from Starlink satellites. “It’s quite alarming how quickly the situation has deteriorated,” Bassa remarked.

 

This issue isn’t limited to Starlink. Several other companies, including OneWeb and Shanghai Spacecom Satellite Technology, are working on launching their own massive satellite constellations. Some researchers estimate there could be over 100,000 satellites in low Earth orbit by the end of the decade, further complicating efforts to protect astronomical observations.

 

LOFAR’s findings suggest that part of Starlink’s hardware is acting like an unintended antenna, emitting signals across a broad range of frequencies. These frequencies overlap with those used by radio telescopes to study ancient cosmic phenomena, such as the formation of the universe’s first galaxies and the period before the first stars emerged.

 

In addition to the unexpected interference, researchers identified more satellites emitting strong signals than official records suggested. These could be part of the U.S. Department of Defense’s Starshield project, hinting at the presence of undisclosed military Starlink satellites, potentially exacerbating the issue.

 

While SpaceX engineers have previously worked with radio astronomers to reduce emissions, the results from the latest generation of satellites have been disappointing. Phil Diamond, Director of the Square Kilometre Array (SKA) Observatory, expressed frustration over the increased emissions. Efforts are underway to address the problem, with SpaceX conducting its own tests in collaboration with SKA engineers.

 

Aaron Boley, an astronomer from the University of British Columbia, emphasized the need for stricter regulation of satellite operators. “This is a serious threat to the future of radio astronomy,” he stated, urging for greater responsibility from companies deploying large satellite constellations.