This map shows light pollution in the United States. (Photo: Gavin Heffernan and Harun Mehmedinović)
Now for some pretty pictures of Mother Earth and Sister Sky.
You've *got* to check out this article on Mother Nature Network, on the trip Gavin Heffernan and Harun Mehmedinovic took to capture the skies of North America before light pollution takes over. And, of course, look at the video at the top of the page.