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English: Mara Chen first noticed the missing hour because of a student question. It was the morning after the Perseid meteor shower, and the public observatory at Red Mesa was full of tired volunteers, empty coffee cups, and visitors comparing photographs on their phones. Mara, a research assistant in her first year at the observatory, had spent most of the night helping a group of university students collect brightness measurements from the automated telescope. At 3:10 a.m., the telescope had been pointing toward a section of sky near Perseus. At...
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