By Ross Chambless
http://stream.publicbroadcasting.net/production/mp3/kuer/local-kuer-874735.mp3
Bryce Canyon, UT – For 10 years, the National Park Service has been measuring light pollution, how bright lights obscure views of the heavens. They've been educating park visitors and local communities in southern Utah about the benefits of preserving natural darkness. In the first of a two-part series, Ross Chambless has the story.