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When Was Black Hole Discovered? Or, ब्लैक होल की खोज कब हुई? Or, Black Hole Ki Khoj Kab Hui?

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सन् 1972 ई० में सबसे पहले ब्लैक होल की पहचान की गई थी। यह सिग्नस (Cygnus) एक्स-1 के दुहरे तारे हैं।

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