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An Anonymous Coward writes:

The loss of dark skies is so painful, astronomers coined a new term for it: 'Noctalgia' [space.com], a feature of the modern age.

Most of our light pollution comes from sources on the ground, but satellites don't just spoil deep-space astronomical observations when they cross a telescope's field of view; they also scatter and reflect sunlight from their solar arrays. The abundance of satellites is causing the overall brightness of the sky to increase all around the globe. Some researchers have estimated that, on average, our darkest night skies, located in the most remote regions of the world, are 10% brighter than they were a half century ago.

Humans are ineffably impacted. How can someone who has never seen a clear night sky know what they are missing? It's like someone without gonads or genital nerves trying to understand orgasm.

Many animal species are suffering as well. What good are night-adapted senses in nocturnal species if the night sky isn't much darker than the daytime sky? Researchers have identified several species whose circadian rhythms are getting thrown off, making them vulnerable to predation (or, the reverse: the inability to effectively locate prey).

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