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के हो ब्ल्याक होल (Black Hole) ?

अन्ततः वैज्ञानिकहरुले ब्ल्याक होल (कृष्ण छिद्र) को तस्बिर सार्वजनिक गरेका छन् । तपाईलाई लाग्न सक्छ यो ब्ल्याक होल भनेको के

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