the stars have gone out in the eyes of many. who live in the developed world. this is what the planet looks like at night artificial light illuminates large surfaces of the northern hemisphere. is the largest dam in western europe. the waters of the glory on a river serve as the boundary between spain and portugal. the portuguese were the pioneers in promoting astro tourism. the idea arose in two thousand and eight as part of creating a sustainable program for the ok region to offer something unique in terms of