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天然桥梁国家纪念碑,2007年世界上第一个国际黑暗天空公园 。(图片鸣谢:NPS/雅各布·w·弗兰克)神秘的地球uux.cn)据美国太空网杰米·卡特) :光污染猖獗且日益严重 。然而 ,尽管北美是地球上光污染...
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