In 2021, hundreds of citizen scientists walked a distance of 600 km, counting up and classifying all of the outdoor lights they could see while they did it. The results of their observations have just been published in the journal Nature Cities: https://www.nature.com/articles/s44284-025-00239-5

Find out why they did it, and what they found out in this thread 👇

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#CitizenScience#LightPollution#OpenAccess#NighttimeLights #RemoteSensing #Nachtlichter