SpaceX burns 260 Starlink satellites in six months: environmental risk?

What happened?

SpaceX submitted a semi-annual report to the FCC (filed December 1, 2025, per the agency's stamp) revealing that between December 2025 and May 2026, the company deorbited and intentionally disintegrated 260 Starlink satellites in Earth's atmosphere. Of these, 176 were first-generation satellites (V1 and V1.5), each weighing 260 to 295 kg, and the rest were second-generation (V2 Mini and V2), weighing 800 to 1,250 kg. Another 349 satellites were decommissioned during the same period and will be disposed of in the coming months, bringing the total retired satellites to 609 in six months. This disposal rate (approximately 2 satellites per day) is higher than the previous period: between December 2024 and May 2025, SpaceX deorbited 472 satellites, according to the prior report. The company justifies these controlled reentries as part of the satellites' planned lifecycle, with a lifespan of about five years, allowing replacement with newer versions, such as V2 satellites capable of Starlink Mobile.

Why is it important?

The Starlink constellation already exceeds 10,000 satellites in orbit, according to FCC data, and each satellite has a lifespan of approximately five years. When fuel runs out, they are programmed for a controlled reentry that incinerates them 100% completely, avoiding space debris generation. However, burning thousands of kilograms of material — each first-generation satellite weighs between 260 and 295 kg, and second-generation between 800 and 1,250 kg — releases metal oxides (such as aluminum, copper, and lithium) and other compounds into the upper atmosphere, specifically the mesosphere and stratosphere, at altitudes between 50 and 80 km. A 2023 study in Geophysical Research Letters estimated that the reentry of a 250 kg satellite can generate up to 30 kg of aluminum oxide nanoparticles, which remain in the atmosphere for years and could catalyze reactions that deplete the ozone layer. Although the scientific community is still debating long-term effects, the rapid growth of megaconstellations (SpaceX plans to deploy up to 42,000 satellites) has led researchers like Dr. Aaron Boley (University of British Columbia) to call for urgent studies and international regulation. Compared to the 1990s, when satellite reentries were sporadic, we now face a continuous and massive flow: if the planned 42,000 satellites are deployed, with replacement every five years, about 8,400 tons of material would be incinerated annually, equivalent to 23 tons per day.

Consequences and regulatory debate

Amid environmental concerns, the FCC proposed in 2024 to exclude satellites from environmental assessments required by the National Environmental Policy Act (NEPA), arguing that reentries occur in outer space, considered extraterritorial. This proposal, not yet approved, has drawn criticism from environmental groups like Earthjustice, which note that NEPA applies to federal actions affecting the human environment, including the atmosphere. Additionally, the FCC has been accused of shirking its responsibility by not requiring cumulative impact studies. Meanwhile, SpaceX advances its expansion plans: it has already obtained approval for 7,500 additional second-generation satellites and is developing orbital data center satellites, such as the A1, with 120 kW of computing capacity, and building an 11-million-square-foot gigafactory in Texas for mass production. This growth contrasts with the lack of international regulation: the ITU only sets frequency coordination, and the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS) has yet to adopt binding guidelines on reentry emission limits.

What should readers know?

• SpaceX routinely destroys satellites as part of their planned lifecycle; in the last six months, it deorbited 260 and has another 349 pending.
• Atmospheric incineration avoids space debris but raises questions about chemical pollution in the stratosphere, with potential effects on the ozone layer.
• The FCC seeks to eliminate environmental assessment requirements for satellites, which could accelerate megaconstellation deployment without impact studies.
• The disposal rate (260 in six months) could increase dramatically if the planned 42,000 satellites are deployed, generating a continuous flow of incinerated material.
• There is no clear international regulation on reentry emission limits; only non-binding guidelines from NASA and ESA exist.
• SpaceX claims that recovering satellites is technically and financially unfeasible, so incineration is the only current option.