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Satellites Make up to 80,000 Flashing Glints Per Hour. It's a Big Problem for Astronomers - Universe Today
(www.universetoday.com)
this post was submitted on 06 Nov 2023
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It's reflected light from the Sun as they orbit, not lights installed on them. Maybe they can use a non-reflective coating or something for new ones though
You will be pleased to know starlink has recently started doing exactly that after working with astronomers to mitigate this issue.