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Right after de Big bang | 14 billion years ago

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Right after de Big bang | 14 billion years ago

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In the first moments after the Big Bang, the universe was extremely hot and dense. As the universe cooled, conditions became just right to give rise to the building blocks of matter  the quarks and electrons of which we are all made. As the universe continued to expand and cool, things began to happen more slowly.

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Galaxy formation period | 14 to 9 billion years ago

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Galaxy formation period | 14 to 9 billion years ago

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After the Big Bang, space was made up almost entirely of hydrogen and helium. Some astronomers think that gravity pulled dust and gas together to form individual stars, and those stars drew closer together into collections that ultimately became galaxies.

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Our solar system began forming about 4.6 billion years ago within a concentration of interstellar dust and hydrogen gas called a molecular cloud. The cloud contracted under its own gravity and our proto-Sun formed in the hot dense center. It was mainly composed of hydrogen and helium, but with some “contamination” by the heavier elements created by the previous generations of stars.

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Formation of the Earth | 4.5 billion years ago

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Formation of the Earth | 4.5 billion years ago

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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.

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Formation of the planets | 4.5 billion years ago

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Formation of the planets | 4.5 billion years ago

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The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation. The currently accepted method by which the planets formed is accretion, in which the planets began as dust grains in orbit around the central protostar.

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Formation of the moon | 4.5 billion years ago

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Formation of the moon | 4.5 billion years ago

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What is most widely accepted today is the giant-impact theory. It proposes that the Moon formed during a collision between the Earth and another small planet, about the size of Mars. The debris from this impact collected in an orbit around Earth to form the Moon.

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https://www.space.com/25126-big-bang-theory.html

https://www.space.com/15680-galaxies.html

https://plancksatellite.org.uk/science/timeline/solarsystem/

https://earthsky.org/search/2020/?s=2020

https://solarsystem.nasa.gov/planets/earth/in-depth/#:~:text=When%20the%20solar%20system%20settled,mantle%2C%20and%20a%20solid%20crust.

https://www.nhm.ac.uk/discover/how-did-the-moon-form.html#:~:text=What%20is%20most%20widely%20accepted,Earth%20to%20form%20the%20Moon.