Planners have long known this would happen. First generation (Gen1) Starlink satellites are being retired to make way for newer models. “More than 500 of the 4700 Gen1 Starlinks have now reentered,” says McDowell.

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When Starlinks reenter, they disintegrate before hitting the ground, adding metallic vapors to the atmosphere. A study published in 2023 found evidence of the lingering debris. In February 2023, NASA flew a WB-57 aircraft 60,000 feet over Alaska to collect aerosols. 10% of the particles contained aluminum and other metals from the “burn-up” of satellites.

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