What do we have to lose if Starlink satellites and others like them take over the night sky? Studying dark matter, observing distant galaxies, and finding signs of extraterrestrial intelligence.

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Starlink train
18 April 2020, Brandenburg, Sieversdorf: Two "Starlink" satellites can be seen as stripes of light in the night sky (shot with an exposure time of 15 seconds).

Patrick Pleul/picture alliance via Getty Images

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