SpaceX has submitted filings to the U.S. The ambitious project, which aligns with broader tech industry efforts by companies like Amazon and Blue Origin to scale up computational capacity outside Earth’s atmosphere, aims to harness solar energy to ease terrestrial power demands. However, atmospheric scientists and astronomers are sounding alarms over the massive environmental and structural toll such a deployment could exact on the planet’s upper atmosphere.
The proposal arrives as terrestrial artificial intelligence infrastructure faces severe resource bottlenecks. According to data cited from the Electric Power Research Institute, data centers in the United States could consume up to 17 percent of the nation’s total electricity by 2030, a surge that threatens to force the reactivation of fossil-fuel power plants and draw millions of liters of water for cooling systems. By moving these computing hubs into orbit, space ventures hope to bypass local zoning roadblocks and power grid limitations. Yet, researchers warn that transferring the computing load to low Earth orbit would trade ground-level energy crises for unprecedented atmospheric and astronomical hazards.
If these plans move forward, the frequency of rocket launches and satellite reentries would multiply by a factor of one hundred. Aaron Boley, a professor of astronomy and space sustainability at the University of British Columbia, explained to Space.com that rocket launches and reentries represent virtually the only human activities that deposit materials directly into the upper atmosphere, where emissions exert a disproportionately large impact.
Environmental Toll of Rocket Launches and Orbital Debris
The environmental friction of the proposal is twofold, centering on both the ascent of launch vehicles and the eventual descent of dead hardware. During launch, most rockets emit black carbon, which significantly intensifies global warming. Although SpaceX’s heavy-lift Starship vehicle utilizes liquid oxygen and liquid methane—a cleaner propellant combination than the kerosene burned by older Falcon 9 rockets—its sheer scale offsets those environmental gains.
Eloise Marais, a professor of atmospheric chemistry at University College London, cautioned that because Starship is a much larger rocket that burns significantly more propellant, the emissions difference per launch is practically neutralized. Each Starship launch produces a massive volume of carbon dioxide equivalent, matching the annual greenhouse gas output of numerous gasoline-powered automobiles. Deploying a megaconstellation would require thousands of launches, translating to numerous flights per year—a staggering leap from the 324 global rocket launches recorded in 2025.
Furthermore, black carbon can linger in the upper atmosphere for up to three years. Unlike tropospheric pollution, which is washed out by precipitation within weeks, high-altitude emissions lack a rapid natural removal mechanism. Beyond the launches, the end-of-life reentry phase presents severe chemical risks. While current constellations like the Starship V2 Mini weigh approximately 800 kilograms, future data-center satellites could reach up to 7.5 tonnes each, featuring sprawling solar panels up to 75 meters wide.
Stratospheric Contamination and Ozone Depletion
Because onboard technology rapidly ages, operators plan to replace these orbital units roughly every five years, resulting in hundreds of tonnes of metal vaporizing in the atmosphere annually. This artificial ablation would eclipse the volume of natural meteorites entering the atmosphere.
These satellites are constructed primarily of aluminum. Upon incineration during atmospheric reentry, aluminum transforms into aluminum oxide, a compound known to deplete the ozone layer. Scientists emphasize that the cumulative chemical reactions at high altitudes remain poorly understood. Marais pointed out that researchers still lack a complete understanding of high-altitude chemical reactions and the specific tipping points that could shift minor atmospheric impacts into major ecological crises, stating that significantly more observation and time are required to investigate the phenomenon.
Boley echoed these concerns with a more urgent assessment, asserting that society must fully comprehend these atmospheric mechanisms before launching a million satellites rather than deploying them blindly and observing the consequences. Alongside the climatic warnings, astronomers warn of severe optical disruptions. A recent study by the European Southern Observatory concluded that if all planned megaconstellations are successfully deployed, ground-based optical astronomy could become entirely untenable due to mounting light pollution.
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