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For millennia, human beings have gazed into the firmament and been awed by the thousands of stars, galaxies, nebulae and other cosmic wonders visible to the naked eye. But in recent generations, much of humanity has become divorced from these marvels. Today, at least 80 percent of people living in the United States and Europe are so inundated with light pollution that they can't even see our own Milky Way, let alone our neighboring galaxies like Andromeda.