Light pollution now blots out the Milky Way for eight in 10 Americans. Bright areas in this map show where the sky glow from artificial lighting blots out the stars and constellations. An international team of researchers has released the new World Atlas of Artificial Sky Brightness, in a paper published in Science Advances today. Credit: Falchi et al, Science Advances; Jakob Grothe/National Park Service, Matthew Price/CIRES/CU-Boulder.
The Milky Way is but a faded memory to one third of humanity and 80% of Americans, according to a new global atlas of light pollution. In most developed countries, the ubiquitous presence of artificial lights creates a luminous fog that swamps the stars and constellations of the night sky. “We’ve got whole generations of people in the United States who have never seen the Milky Way,” said Chris Elvidge, NOAA’s National Centers for Environmental Information in Boulder, CO. “It’s a big part of our connection to the cosmos—and it’s been lost.”
Using high-resolution satellite data and precision sky brightness measurements, their study produced the most accurate assessment yet of the global impact of light pollution. The atlas takes advantage of low-light imaging now available from the NOAA/NASA Suomi National Polar-orbiting Partnership satellite, calibrated by thousands of ground observations.
Light pollution is most extensive in countries like Singapore, Italy and South Korea, while Canada and Australia retain the most dark sky. In western Europe, only small areas of night sky remain relatively undiminished, mainly in Scotland, Sweden and Norway. Despite the vast open spaces of the American west, almost half of the U.S. experiences light-polluted nights. “In the U.S., some of our national parks are just about the last refuge of darkness – places like Yellowstone and the desert southwest,” said co-author Dan Duriscoe of the National Park Service. “We’re lucky to have a lot of public land that provides a buffer from large cities.”
Unnatural light can confuse or expose wildlife like insects, birds and sea turtles, with often fatal consequences. Fortunately, light pollution can be controlled by shielding lights to limit shine to the immediate area, reducing lighting to the minimum amount needed—or by simply turning them off.
http://research.noaa.gov/News/NewsArchive/LatestNews/TabId/684/ArtMID/1768/ArticleID/11758/Milky-Way-now-hidden-from-one-173third-of-humanity.aspx
Recent Comments