TOKYO, July 7 — For the past several months, a quiet but significant experiment has been playing out in the upper reaches of our atmosphere. SpaceX, the private aerospace company founded by Elon Musk, has deliberately steered and incinerated 260 of its Starlink satellites over a six-month period, from December 2024 to May 2025. Each satellite, weighing roughly 2,700 pounds — or about 1,225 kilograms — means the company burned up approximately 702,000 pounds of orbital hardware, the equivalent of 318,500 kilograms, during that time.
This is not an accident. The satellites are guided into the atmosphere at the end of their operational lives to prevent them from becoming space debris, a growing concern for the safety of other spacecraft and the International Space Station.
But as these massive objects vaporize at extreme temperatures, they release their constituent materials into the stratosphere. Aluminum, copper, and other metals are turning into fine particulates and oxides, raising questions that scientists are only beginning to explore.
What goes up must come down — in pieces
The practice of deorbiting satellites is standard for responsible operators. But the sheer scale of Starlink’s constellation changes the equation. As of May 2025, the company had over 6,000 satellites in orbit, making it by far the largest single constellation ever deployed.
When each of those satellites eventually reaches the end of its life — typically after several years — it will be sent back through the atmosphere, adding to a cumulative load of vaporized metals that has no historical precedent. The concern among atmospheric scientists is specific.
When aluminum, a primary component of satellite structures, is vaporized at the high temperatures of reentry, it forms aluminum oxides. These particles can linger in the upper atmosphere for years. Some researchers worry that these particles could alter the chemistry of the stratosphere, potentially damaging the ozone layer that protects all life on Earth from harmful ultraviolet radiation.
Others are studying whether the particles could act as nucleation sites for cloud formation, changing weather patterns in ways that are not yet understood. Critics of the rapid expansion of mega-constellations point out that no definitive peer-reviewed studies have yet quantified the long-term atmospheric effects of mass satellite incineration.
Several research groups, however, have begun modeling the potential consequences. The gap between the pace of deployment and the pace of scientific understanding is a source of growing unease.
A regulatory crossroads
At the center of this debate sits the Federal Communications Commission (FCC), the US agency that licenses satellite communications. The FCC is currently considering a proposal that would exempt certain satellite constellations from environmental review under the National Environmental Policy Act, known as NEPA. This proposed exemption would apply to satellites operating below 600 kilometers altitude — a category that includes most Starlink spacecraft.
Environmental review under NEPA typically requires agencies to consider the potential impacts of a project on the natural environment before granting approval. Critics argue that exempting satellite constellations from this process would allow the rapid growth of mega-constellations without a thorough understanding of their cumulative atmospheric impacts.
The FCC’s proposal has drawn attention from environmental groups, scientists, and policymakers who question whether the existing regulatory framework is adequate for the scale of modern space operations. The company itself has not commented publicly on the specific concerns about atmospheric chemistry from satellite incineration. But the numbers speak for themselves: 260 satellites in six months, each one carrying materials that do not simply disappear when they burn up.
Closer to home — what it means for communities across Asia
For communities across Asia, the implications of this story are not abstract. The ozone layer protects everyone on the planet, regardless of where they live. Changes to atmospheric chemistry do not respect national borders.
If the particles released by satellite incineration do damage the ozone layer, the effects would be felt most acutely in regions with high exposure to ultraviolet radiation, including many parts of Southeast Asia and the Pacific. Furthermore, the rapid growth of satellite constellations like Starlink has brought high-speed internet to remote areas across the region, connecting villages in the Philippines, Indonesia, and other island nations that previously had limited access.
The service has been a lifeline for many communities. But the environmental cost of maintaining that connectivity — the steady stream of satellites being launched and then burned up — is something that families across the region may one day have to reckon with. The trade-off between connectivity and environmental impact is not unique to Asia.
It is a global question. But for communities that rely on satellite internet for education, healthcare, and economic opportunity, the stakes are particularly high.
The same technology that brings the world closer may also be altering the very air we breathe.
What to watch next
The FCC’s decision on the NEPA exemption proposal is expected in the coming months. If the exemption is granted, it could accelerate the deployment of even more satellites without environmental review. If it is denied, it could slow the pace of constellation expansion as companies are required to study the atmospheric effects of their operations.
Meanwhile, the research continues. Several scientific groups are working to model the long-term effects of mass satellite incineration, but peer-reviewed results have not yet been published.
Until those studies are complete, the question of whether satellite mega-constellations are altering the ozone layer or affecting cloud formation will remain unanswered. What is clear is that 260 satellites have already been burned up in six months. Thousands more will follow.
The atmosphere is absorbing the residue of humanity’s space ambitions, and scientists are only beginning to understand what that means.
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