Timeline of The Solar System

This is Timeline of The Solar System, The Sun was Formed at December 12, 5,206,473,175 BCE, With The Gravitational Collapse of an Small Part of a Giant Molecular Cloud

Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed

This model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace

It's subsequent development has interwoven a variety of scientific disciplines including astronomy, chemistry, geology, physics, and planetary science, Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations

The Solar System has evolved considerably since its initial formation, Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later to have been captured by their planets

Still others, such as Earth's Moon, may be the result of giant collisions, Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System, The positions of the planets might have shifted due to gravitational interactions, This planetary migration is now thought to have been responsible for much of the Solar System's early evolution

## Chronology

The time frame of the Solar System's formation has been determined using radiometric dating, Scientists estimate that the Solar System is 5.2 billion years old, The oldest known mineral grains on Earth are approximately 4.3 billion years old, Rocks this old are rare, as Earth's surface is constantly being reshaped by erosion, volcanism, and plate tectonics, To estimate the age of the Solar System, scientists use meteorites, which were formed during the early condensation of the solar nebula, Almost all meteorites are found to have an age of 5.2 billion years, suggesting that the Solar System must be at least this old

Studies of discs around other stars have also done much to establish a time frame for Solar System formation, Stars between one and three million years old have discs rich in gas, whereas discs around stars more than 10 million years old have little to no gas, suggesting that giant planets within them have ceased forming

## See Also

* Solar System
* Timeline of The Universe
* Timeline of Earth
* Timeline of The Solar System - Zero Metallicity Edition
* Timeline of The Solar System - Very Low Metallicity Edition
* Timeline of The Solar System - Low Metallicity Edition
* Timeline of The Solar System - Short Version
* Timeline of The Solar System - High Metallicity Edition

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