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Learn about Earth, the third planet from the Sun and the only place with life. Find out about its features, climate, atmosphere, history, and more.
- History
While the Earth was in its earliest stage (Early Earth), a...
- Internal structure
Geological cross section of Earth, showing the different...
- History
While the Earth was in its earliest stage (Early Earth), a giant impact collision with a planet-sized body named Theia is thought to have formed the Moon. Over time, the Earth cooled, causing the formation of a solid crust, and allowing liquid water on the surface.
Learn about Earth, the third planet from the Sun and the only one with life. Find out about its orbit, history, geology, atmosphere, people and future.
1 day ago · Learn about Earth, the third planet from the Sun and the only place in the universe known to harbour life. Explore its structure, composition, temperature, mass, and more from Britannica's comprehensive article.
- Earth is the third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass. Its near-surface environments ar...
- Earth is located in the Orion-Cygnus Arm, one of the four spiral arms of the Milky Way, which lies about two-thirds of the way from the centre of t...
- Earth’s name in English, the international language of astronomy, derives from Old English and Germanic words for ground and earth, and it is the o...
- Earth and the other planets in the solar system formed about 4.6 billion years ago. The early Earth had no ozone layer and no free oxygen, lacked o...
- Viewed from another planet, Earth would appear bright and bluish in colour. In latitudinal belts, swirling white cloud patterns of midlatitude and...
Geological cross section of Earth, showing the different layers of the interior. The internal structure of Earth are the layers of the Earth, excluding its atmosphere and hydrosphere.
The geological history of the Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy).
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When did Earth form?
Learn how the age of Earth is estimated to be 4.54 billion years based on radiometric dating of meteorites, lunar samples and terrestrial rocks. Explore the history of geologic concepts and early calculations of Earth's age.
