Stars in the constellations Cygnus and Lyra (left), and Draco (middle-right)a appear above the city lights of Innsbruck, embraced by the Alps. The clean air and good sky transparency above this capital of Alps still allow to see starry sky from the mountains at the edge of the city while light pollution has vanished away the sky of the most major cities around the world. The city light has strongly illuminated the inversion layer. © Christoph Malin



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