Terre
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.
Lunes dans la base de connaissances
Sources de données
Les outils et les leçons utilisent des modèles simplifiés à des fins d’apprentissage uniquement, ils ne doivent pas être utilisés pour la navigation, la planification de mission ou toute décision opérationnelle. Les certificats sont gratuits et non accrédités. Lire l'avis de non-responsabilité sur le contenu éducatif