Light Pollution At the beginning of the 21st century, humanity is losing a valuable and beautiful part of its heritage. For the first time in history, poorly designed and badly aimed lighting is denying vast numbers of humanity a view of the night sky. Urban sky glow now pollutes nearly all of Britain's night skies. As amateur astronomers we have a responsibility to guard our night time environment against light pollution. What is light pollution? Light pollution is the popular name for sky glow - a brightening of the night sky caused by the scattering of artificial light by aerosol...