A typical black hole is always specified by प्रारुपी कृष्ण-विवर सर्वदा किसके द्वारा विनिर्दिष्ट होता है?

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A typical black hole is always specified by प्रारुपी कृष्ण-विवर सर्वदा किसके द्वारा विनिर्दिष्ट होता है?