Résultats de recherche
Earth is the third planet from the Sun and the only astronomical object known to harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all of Earth's water is contained in its global ocean, covering 70.8% of Earth's crust.
- History
Earth formed around 4.54 billion years ago, approximately...
- Internal structure
The internal structure of Earth are the layers of the Earth,...
- Age
Age of Earth. The age of Earth is estimated to be 4.54 ±...
- History
L' Hadéen débute il y a 4,54 milliards d'années (Ga), lorsque la Terre se forme en même temps que les autres planètes à partir d'une nébuleuse solaire — une masse de poussières et de gaz en forme de disque, détachée du Soleil en formation 1, 3, 4 .
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
Il y a 5 jours · Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbor life.
Earth also turns around in space, so that different parts face the Sun at different times. Earth goes around the Sun once (one year) for every 365 1 ⁄ 4 times it turns around (one day). Earth is the only planet in the Solar System that has a large amount of liquid water on its surface.
The internal structure of Earth are the layers of the Earth, excluding its atmosphere and hydrosphere. The structure consists of an outer silicate solid crust , a highly viscous asthenosphere , and solid mantle , a liquid outer core whose flow generates the Earth's magnetic field , and a solid inner core .
Age of Earth. The age of Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). [1] [2] [3] [4] This age may represent the age of Earth 's accretion, or core formation, or of the material from which Earth formed. [2]
