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A map showing the extent of light pollution across the U.S. Credit: P. Cinzano, F. Falchi (University of Padova), C. D. Elvidge (NOAA National Geophysical Data Center, Boulder). Copyright Royal Astronomical Society. Reproduced from the Monthly Notices of the RAS by permission of Blackwell Science.

Globe at Night, which promotes the value of dark skies, set a record in 2010 with more than 17,800 measurements of night sky light pollution. The program teaches about the impact of excessive artificial lighting on local environments, and the ongoing loss of a dark night sky as a shared natural resource. Read more»