Researchers from the German „Loss of the Night“ project have developed an app for Android smart phones, which counts the number of visible stars in the sky. The data from the app will be used by scientists to understand light pollution on a world wide scale.
"In natural areas you can see several thousand stars with the naked eye" says Dr. Christopher Kyba, physicist at the Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB) and Freie Universität. "In Berlin, we can still see several hundred, but the situation in most large cities and world capitals is far worse." The smartphone app will evaluate sky brightness, also known as skyglow, on a worldwide scale.