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Singularities
Astronomy Picture of the Day: A Plurality of Singularities at the Galactic Center
A recent informal poll found that astronomers don't yet have a good collective noun for a group of black holes, but they need one.
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راهی به مرکز کهکشان
مراحل ماه گرفتگی 5 مرداد 97
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گنبد های فراموش شده
epsilon LYRAE
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