The night sky is not completely dark even in the remotest places there is a glow in the sky produced by natural components, both terrestrial and extraterrestrial, and by artificial lighting of human origin. Of the 44 photometers in the survey, the Roque de los Muchachos Observatory (GarafĂa, La Palma, Canary Islands) stands out at the darkest of all the skies analyzed.
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