دكتور في فيزياء الفلك، باحث سابق في وكالة ناسا، كاتب، مفكّر، هدفي نشر العلم، قناتي على اليوتيوب. Arab (Algerian) astrophysicist; educator, writer @ Amer. Univ.
ID:1200524845
linkhttps://bit.ly/2x9JVBG calendar_today20-02-2013 11:01:16
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