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The Autumn Night Sky When we gaze up at the night sky, at first glance it appears to be a random collection of pinholes in the curtain of night. But look again, and you will start t
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Document Date: 2013-07-10 13:46:29
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The Autumn Night Sky When we gaze up at the night sky, at first glance it appears to be a random collection of pinholes in the curtain of night. But look again, and you will start t