History of Earth - Wikipedia
Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4][5][6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
Formation of Earth - National Geographic Society
2023年10月19日 — Our planet began as part of a cloud of dust and gas. It has evolved into our home, which has an abundance of rocky landscapes, an atmosphere that supports life, and oceans filled with mysteries. Asteroids were not only important in Earth's early formation, but have continued to shape our planet.
Formation of The Earth : Earth's Birth, Timeline and Layering
2024年7月1日 — Key points in Earth’s formation include the initial birth of our planet within the solar nebula, the differentiation into layers, and the dynamic interplay of geological processes that have shaped the Earth we know today.
How did Earth form? | Space
2022年4月8日 — Earth's rocky core formed first, with heavy elements colliding and binding together. Dense material sank to the protoplanet's center while lighter material built up the crust.
How the Earth and moon formed, explained - University of …
Understanding how the Earth and moon formed is important for piecing together the history of the solar system and answering questions like how long planets take to form, what planets are made of, and what makes a planet suitable for life.
In Depth | Earth – NASA Solar System Exploration
When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle, and a solid crust.
Earth - Wikipedia
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.
Geological history of Earth - Wikipedia
Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System. Initially, Earth was molten due to extreme volcanism and …
Earth - Structure, Composition, Development | Britannica
3 天之前 — Earth - Structure, Composition, Development: The origin of Earth in its present form has long been the subject of intellectual interest, but since the mid-20th century scientists have made particularly significant advances both in concepts and in measurements.
2.3: Formation and evolution of the Earth - Geosciences LibreTexts
2008年1月21日 — Formation of the Earth. The Earth formed by accretion of solid and particulate material that remained after the much more massive amounts of hydrogen and helium present in the original protoplanets had been dispersed out of the solar system.