وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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هو كوكب يدور حول نجمٍ آخر غير الشمس. وتعود كلمة خارجي إلى أنه خارج المجموعة الشمسية. تقع صعوبة رصد الكواكب الخارجية في أنها لا تشع ضوء من نفسها كما أنها تقع بجانب نجوم مشعة، فيختفي الكوكب وسط سطوع نجمه. يوجد الكثير من المشاريع البحثية التي تبحث عن الكواكب الخارجية وعن تلك الشبيهة بالأرض وصالحة للحياة، أشهرها هو تليسكوب كيبلر الفضائي الذي استطاع رصد أكثر من 2600 كوكب خارجي.
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