كوكب خارجي أصغر من المريخ

كوكب خارجي أصغر من المريخ
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كوكب خارجي أصغر من المريخ
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البحث عن الكواكب الخارجية يأخذ منحى جديدًا. في مجلة Nature أمس، كشف فريق من الفلكيين الأمريكيين عن قياسهم لأقطار وكتلة، وبالتالي لكثافة، ثلاثة كواكب خارجية صخرية في منظومة النجم كبلر-138. أحدها أصغر من كوكب المريخ، مع كتلة 0.06 مرات من الأرض، ضد 0.1 مرات للكوكب الأحمر.

La quête des exoplanètes passe un nouveau cap. Dans la revue Nature, hier, une équipe d'astrophysiciens américains révèlent avoir mesuré la taille et la masse,donc la densité, de trois exoplanètes rocheuses dans le système stellaire Kepler-138. L'une d'elle est encore plus petite que la planète Mars, avec une masse de 0,06 fois celle de la Terre, contre 0,1 fois pour la planète Rouge.

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