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Unless Musk has secretly invented Romulan cloaking technology, being invisible doesn't help when you are trying to look at the stuff behind

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What percentage of the night sky will be obscured if Starlink goes to 30,000 satellites?

Let me guess, if the visual radius of a one meter satellite 550,000 meters away is (1/X)^2. Thirty thousand would be 1/one trillion, or far less?

Its not just about Starlink though, its about setting a precedent before every company and country starts launching competing constellations. When should we start to care after the first few thousand or after hundred of thousands of eventual satellite's?

It would take trillions to appreciably dim the night sky. Wake me then.

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