Elon Musk's Starlink satellites could deplete Earth’s ozone layer, warns study

A recent study from the University of Southern California suggests that the rapid expansion of internet satellite networks, exemplified by Elon Musk's Starlink, could pose a significant threat to the Earth's ozone layer.

The research, published in the Geophysical Research Letters journal, highlightedconcerns over the potential environmental impact of the growing number of low-earth orbit satellites.

According to the study, which examined data from 2016 to 2022, the presence of aluminum oxide in the atmosphere has increased dramatically due to the re-entry of satellites like those in the Starlink constellation.

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These satellites, designed with a short lifespan of about five years, contain significant amounts of aluminum that, upon re-entry into Earth's atmosphere, produce aluminum oxide.

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This compound, the scientists warned, triggers chemical reactions that can lead to ozone depletion. Study said that the oxides could last for decades as the particles drift down.

“Only in recent years have people started to think this might become a problem,” one of the study’s authors Joseph Wang said. “We were one of the first teams to look at what the implication of these facts might be."

Nearly 18.7 tons of aluminum oxide nanoparticles, , in 2022 alone, were released into the atmosphere through satellite burn-up.

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With plans to launch thousands more satellites annually, this number could skyrocket to 397 tonnes per year posing a serious risk of "significant ozone depletion."

While earlier satellites operated at higher altitudes, sacrificing speed for longevity, the new approach is to meet the soaring demand for global internet connectivity.

Elon Musk's SpaceX, the driving force behind Starlink, has already launched thousands of satellites since 2019, forming a dense web in low-earth orbit.

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“The environmental impacts from the reentry of satellites are currently poorly understood,” the scientists say adding,“As reentry rates increase, it is crucial to further explore the concerns highlighted in this study."

While the European Space Agency noted a significant ozone hole over Antarctica in 2023, citing its size, the role of satellite emissions in exacerbating such phenomena remains under scrutiny.

"Unanticipated growth of aluminum oxides may push pause on the ozone success story in decades to come," the scientists wrote.

(With inputs from agencies)