„When millions of people turn off their lights for Earth Hour each year, something remarkable happens in the night sky above cities. New research from Hong Kong published in Scientific Reports shows that just a small number of decorative buildings and advertising boards can dramatically brighten the entire urban night sky and when they go dark, the sky becomes up to 50% darker.“

https://phys.org/news/2025-07-bright-entire-night-sky.html

#lightpollution #skyglow #facadelighting #darksky #sciencenews