وفر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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عندما تكون كتلة النجم أكبر من التلك المسببة لنجم نيتروني، تنهار عندها نواة النجم بما يعرف بثقبٍ أسود، وهو منطقة في الكون ذات مجال جاذبية قوي جداً حتى الضوء لا يستطيع الإفلات منه، وتعرف حدود هذه المنطقة بأفق الحدث. تعرف هذه الثقوب السوداء بالثقوب السوداء النجمية. يعتقد العلماء أن في مركز كل المجرات العملاقة يقع ثقب أسود عملاق، قد تصل كتلته إلى مليارات ضعف كتلة الشمس، وهو المسؤول على تماسك المجرة في شكلٍ مستقر.
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