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Over 4.5 billion years ago, our solar system formed from a giant molecular cloud that collapsed under its own tremendous gravity. The hot stew of hydrogen and helium gave birth to our sun and flung out a wide disc of gas and particles in the surrounding space.
- 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.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.
Jun 30, 2014 · By measuring the age of rocks on the moon, and meteorites found on Earth, scientists estimate the Earth consolidated by 4.54 billion years ago. The young planet had established an atmosphere...
According to evidence from radiometric dating and other sources, Earth formed about 4.54 billion years ago. [7][8][9] The current dominant theory of planet formation suggests that planets such as Earth form in about 50 to 100 million years but more recently proposed alternative processes and timescales have stimulated ongoing debate in the plane...
Delves into Earth's formation approximately 4.54 billion years ago and its unique characteristics as a geological, atmospheric, and biological entity. It explores Earth's dynamic structure, life-supporting conditions, and the ongoing quest to find other habitable planets in the universe.
Nov 20, 2023 · Dive into the most dramatic events in Earth’s 4.5-billion-year history, from its birth to the emergence of humanity. How did a hellscape of molten lava transform into a lush, green, watery ...
