Only 1 in 5 people in North America live in a place where they can see the Milky Way. That’s the staggering finding of a new paper in Science Advances, in which the authors painstakingly matched satellite images with ground measurements of light pollution around the world.

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Uncle Sam fixes a July 4th supper in the Grand CanyonThere are worse places to spend Independence Day than rafting on the Colorado River through the Grand Canyon. The Grand Canyon is an iconically American site, one full of American history and the spirit of independence and exploration. Native tribes believe that the first humans emerged from one of the springs that feed into the Canyon.

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The Grand Canyon rafters, in Red Wall CavernThe best thing about NCSE’s Grand Canyon trip is the rafters. Also, the Canyon itself. And the food. And the amazing guides who run the boats and cook the meals and lead the hikes and know every bit of river lore you could desire.

Among the best things about NCSE’s Grand Canyon trip are the rafters.

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Astronauts surveying the geology of the Grand CanyonAstronaut Roger Chaffee and geologist Elbert King explore the Grand Canyon, March 5-6 1967.
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