الأرض
Our home: the only world known to have life and liquid water oceans on its surface.
NASA
The only world we know of with oceans on its surface, a breathable atmosphere and life.
Earth is the largest and densest of the rocky planets. About 71% of its surface is covered by oceans, and its nitrogen-oxygen atmosphere and magnetic field shield life from much of the Sun’s harmful radiation.
Its spin axis is tilted about 23.4° to its orbit, which causes the seasons. It has one natural satellite, the Moon. The orbit data here are for the Earth-Moon barycentre, the balance point of the pair.
الأقمار في قاعدة المعارف
مصادر البيانات
وتستخدم الأدوات والدروس نماذج مبسطة لأغراض التعلم فقط، ولا ينبغي استخدامها لأغراض الملاحة أو تخطيط البعثات أو اتخاذ أي قرار تشغيلي.() والشهادات مجانية وغير معتمدة. اقرأ إخلاء المسؤولية عن المحتوى التعليمي