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.
知識ベースの衛星
データ源
ツールとレッスンは学習のための単純化モデルを使用します。航法、ミッション計画またはどんな作戦決定にも使用してはなりません。証明書は無料で認証されていません。 教育用コンテンツの免責事項を読む