In the black areas, the natural night sky is still (mostly) visible. Map of North America’s artificial sky brightness, as a ratio to the natural sky brightness. Here’s their map of artificial sky brightness in North America, represented as a ratio of "natural" nighttime sky brightness. Artificial light from cities has created a permanent "skyglow" at night, obscuring our view of the stars.
They estimate that the Milky Way is no longer visible to fully one-third of humanity - including 60 percent of Europeans and 80 percent of Americans. How hard is it? In a new study for Science Advances, an international team of researchers created the most detailed atlas yet of light pollution around the world. It’s becoming harder and harder to pick out our place in the universe. In big cities, we’re lucky to even glimpse the Big Dipper. Most of us living in urban areas can’t see it because of all the light pollution. That shimmering river of stars is, of course, the Milky Way. If cities were to turn off all their lights - all their street lamps, billboards, neon signs, car headlights - a clear night sky would look something like this: The Milky Way, as seen over Dinosaur National Park in Utah.
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