A new global study of light pollution has identified Northwest Wyoming as having some of the darkest skies in the lower 48 states. The New World Atlas of Artificial Sky Brightness was a collaborative project to map the brightest and darkest places on earth.
Dan Duriscoe, the National Park Service scientist who worked on the atlas, said the area including Grand Teton and Yellowstone National Parks is very dark, and it is likely to stay that way.