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&#13;
&#13;
* النسبية العامة هي نظرية للجاذبية طورت على يد ألبرت أينشتاين بين عامي 1907 م و1915 م. وفقاً للنسبية العامة، فإن التجاذب الملاحظ بين الكتل ينتج من انحناء الزمكان الذي تحدثه هذه الكتل.&#13;
&#13;
مع بداية القرن العشرين، تم قبول قانون الجذب العام لنيوتن كوصف صحيح لقوة الجاذبية بين الكتل لأكثر من 200 عام. في نموذج نيوتن، الجاذبية هي نتيجة قوة تجاذب بين الكتل. &#13;
بالرغم من ارتباك نيوتن بالطبيعة الغير معروفة لهذه القوة، فإن الاطار الأساسي كان ناجحاً للغاية في وصف الحركة.&#13;
&#13;
* مبدأ التكافؤ :&#13;
يعاني شخص والأجسام (طافية بدون حركة أو متحركة بسرعة ثابتة) في مصعد في حالة سقوط حر من انعدام الوزن. بما أن كل شيء داخل المصعد يسقط بتزامن (مع بعض)، &#13;
فإنه لايمكن ملاحظة أي أثر للجاذبية. في هذه الحالة، فإن مشاهدات المراقب في حالة سقوط حر لايمكن تمييزها من مشاهدات المراقبين في الفضاء البعيد، بعيداً عن أي مصدر كبير للجاذبية. &#13;
مثل هولاء هم المراقبون العطاليون الذين وصفهم أينشتاين في نظريته للنسبية الخاصة بأنهم: المراقبون الذين يسافر الضوء نسبة لهم في خطوط مستقيمة وبسرعة ثابتة.&#13;
&#13;
افترض أينشتاين أن المشاهدات المشابهة للمراقبين معدومي الوزن والعطاليين في النسبية الخاصة مثلت خاصية أساسية للجاذبية، جاعلاً تلك الخاصية حجر الزاوية لنظريته للنسبية العامة، &#13;
بشكل رسمي في مبدأه للتكافؤ. بحديث مبسط، ينص المبدأ على أن شخص في مصعد في حالة سقوط حر لايمكنه الأخبار أنه في حالة سقوط حر. كل تجرية مماثلة في بيئة ذات سقوط حر ستحصد ن&#13;
فس النتائج للمراقبين في حالة الراحة (السكون) أو المتحركين بسرعة منتظمة في الفضاء البعيد، بعيداً عن كل مصادر الجاذبية.&#13;
&#13;
&#13;
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