النظام الشمسي

علماء الفلك يحسبون متى ستنتهي الحياة على الأرض

Keep going النظام الشمسي 21 نوفمبر 2013

نظامنا الشمسي، والأرض والمريخ هما الكوكبان الثالث والرابع على التوالي من حيث البعد عن الشمس لا بد من أن يكون الماء سائلا على كوكبٍ م...

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