This book takes a close look at our relationship with the sky, the stars, light and darkness. In particular, it examines how light pollution has interfered with the culture of astronomy and our ability to appreciate this essential facet of our natural world. The sky has always held significance for humanity, in both cultural and scientific terms. And yet we persistently pollute it with (sometimes unnecessary) light in our obsessive desire to chase away the darkness. This effectively switches off the stars, hampering our ability to enjoy one of the most inspiring sights nature has to offer to humankind. In addition, too much light is hazardous