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Debris relatively quickly suffers orbital degradation and re-enters the atmosphere, so there's a cleanup mechanism there.
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What we learn is that Amazon's constellation is at a different altitude than Starlink (590 vs 550km?), and the concern appears to be large amounts of alumina dispersed in the upper atmosphere.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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