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27 فبراير 2013

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حرارة الشمس تتناقص مع مرور الزمن لأن
وزن الشمس ينقص في كل سنة حوالي 150 مليون طن.

معلومات ثقافية، معلومات علمية

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أخر المواضيع من قسم : معلومات ثقافية، معلومات علمية

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