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حقائق وغرائب >> أسئلة فضولية
هل هناك كواكب أخرى خارج النظام الشمسي؟
هل هناك كواكب خارج النظام الشمسي؟ سؤال ورد من «إيلاي دبليو»، 8 سنوات، مدينة باتون روغ، لويزيانا. تساءل البشر عن جواب هذا السؤال لآلاف السنين. وصف الرياضيّ اليوناني القديم «ميترودوروس» (الذي عاش من 350-400 سنة قبل الميلاد) هذا الموضوع كالتالي: «إن عدم وجود أي كواكب أخرى خارج النظام الشمسي في الكون هو ادّعاء قابل للتصديق بدرجة ادعاء وجود حقل لا يحتوي سوى نبتة واحدة». بعد حوالي 2000 عام، وفي القرن السادس عشر، اقترح الفيلسوف الإيطالي «جيوردانو برونو» شيئاً مشابهاً، إذ قال: «يوجد عدد لا يحصى من الشموس والأراضي في أمكنة أخرى من الكون. تدور كل هذه الكواكب حول شموسها بنفس…
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