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Accretion from the solar nebula
- 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.
en.wikipedia.org/wiki/History_of_Earth
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The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs. Eon.
Jul 1, 2024 · 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.
- What Is The CORE Accretion Model?
- What Is The Disk Instability Model?
- What Is Pebble Accretion?
- Additional Resources
Approximately 4.6 billion years ago, our solar system was just a cloud of dust and gas known as a solar nebula. Gravitycollapsed the material in on itself as it began to spin, condensing the matter and forming the sun in the center of the nebula. With the sun beginning to form, the remaining material started to clump up. Small particles drew togeth...
While the core accretion model works for terrestrial planets, gas giants would need to evolve rapidly to grab hold of the significant mass of lighter gases they contain. But simulations with that model have not been able to account for this rapid formation. In those simulations, the process takes several million years, which is longer than light ga...
The disk instability model contends with the core accretion model's issue with time; specifically how quickly massive gas giants would have to grab lighter components. But another, recent model known as pebble accretion, also helps to fill in this explanatory gap. In this model, researchers have shown how smaller, pebble-sized objects could have fu...
Visit NASA's hubfor understanding Earth as a planet.Explore NASA's kid-friendly resourcesfor learning about Earth.Browse NASA's hubfor understanding exoplanets.Oct 19, 2023 · Earth’s early atmosphere was most likely composed of hydrogen and helium. As the planet changed, and the crust began to form, volcanic eruptions occurred frequently. These volcanoes pumped water vapor, ammonia, and carbon dioxide into the atmosphere around Earth.
Sep 22, 2014 · Scientists believe Earth's oceans and atmosphere didn't come along until about four billion years ago, as a result of volcanic activity or meteors hitting Earth and releasing water and gases trapped under its surface.
How and when did the early Earth form? Scientists now think the Earth’s story began around 4.6 billion years ago in a disk-shaped cloud of dust and gas rotating around the early sun, made up of material left behind after the sun’s formation.
Aug 21, 2019 · A history-of-Earth timeline includes everything from the birth of the sun and solar system to present-day earthquakes in California. Changes over the past 4.6 billion years were usually slow and incremental, but also sometimes violent and unforeseen, like giant meteorite strikes.
