what happened a billion years ago ?

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what happened a billion years ago ?

Here are some links that might be useful to you:

https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life

https://en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life
Timeline of the evolutionary history of life – Wikipedia
End Ordovician: 440 million years ago, 86% of all species lost, including graptolites. Late Devonian: 375 million years ago, 75% of species lost, including most trilobites. End Permian, The Great Dying: 251 million years ago, 96% of species lost, including tabulate corals, and most trees and synapsids.
CaveasphaeraEdiacaran BiotaTimeline of Human EvolutionCambrian ExplosionLast Universal Common AncestorWater

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life

https://www.newscientist.com/article/dn17453-timeline-the-evolution-of-life
Timeline of the evolution of life on Earth | New Scientist
The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth and gave rise to complex organisms like animals. By Michael Marshall. 14 July …

https://en.wikipedia.org / wiki / History_of_Earth

https://en.wikipedia.org / wiki / History_of_Earth
History of Earth – Wikipedia
Eons. In geochronology, time is generally measured in mya (million years ago), each unit representing the period of approximately 1,000,000 years in the past. 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 …

https://www.sciencealert.com/timeline-shows-the-entire-history-of-the-universe-and-how-it-ends

https://www.sciencealert.com/timeline-shows-the-entire-history-of-the-universe-and-how-it-ends
This Timeline Shows The Entire History of The Universe … – ScienceAlert
Fast-forward to 10.4 billion years ago, and the Universe achieves habitability for the first time, and life is finally given a chance to emerge. Having said that, we’re going to have to wait for the 4.2-billion-years-ago mark to actually see any life on Earth at all, but from there, things start to happen very quickly.

https://www.britannica.com/science/Hadean-Eon

https://www.britannica.com/science/Hadean-Eon
Hadean Eon | Start, Timeline, & Facts | Britannica
Hadean Eon, informal division of the Precambrian occurring between about 4.6 billion and about 4.0 billion years ago. It was the time of Earth’s initial formation—the accretion of dust and gases, collisions with larger bodies, the stabilization of its core and crust, and the rise of its atmosphere and oceans.

https://www.sciencenews.org/article/milky-way-galaxy-history-timeline-evolution-disk

https://www.sciencenews.org/article/milky-way-galaxy-history-timeline-evolution-disk
Here’s the best timeline yet for the Milky Way’s big events
The new work revises the date of this great galactic encounter: We found that the merger happened 11 billion years ago, Xiang says, a billion years earlier than thought. As the intruder’s …

https://www.nature.com/articles/d41586-021-02450-5

https://www.nature.com/articles/d41586-021-02450-5
The billion years missing from Earth’s history – Nature
For more than 150 years, geologists have been aware of ‘missing’ layers of rock from the Earth’s geological record. Up to one billion years appear to have been erased in what’s known as …

https://www.astronomy.com/observing/the-beginning-to-the-end-of-the-universe-our-solar-systems-origin

https://www.astronomy.com/observing/the-beginning-to-the-end-of-the-universe-our-solar-systems-origin
The Beginning to the End of the Universe: Our solar system’s origin
Those episodes happened 5.7 billion, 1.9 billion, and 1 billion years ago. Each correlates to when Sag DEG made one of its closest approaches to the Milky Way, coming within about 26,000 light-years.

https://www.encyclopedie-environnement.org/en/life/once-upon-a-time-life-chemistry-in-earths-ocean-4-billion-years-ago

https://www.encyclopedie-environnement.org/en/life/once-upon-a-time-life-chemistry-in-earths-ocean-4-billion-years-ago
Once upon a time when life appeared: chemistry in the earth’s ocean 4 …
1. A long time ago, in a galaxy not so far away. About 4.6 billion years ago, in an off-centre location in the spiral galaxy we call the Milky Way, a vast disc of matter was formed. Most of the gases, grains, blocks that made up this disc have concentrated and fused, to form a star, the Sun.

https://www.nationalgeographic.org/article/formation-earth

https://www.nationalgeographic.org/article/formation-earth
Formation of Earth – National Geographic Society
A few hundred million years after this process—around 2.2 billion to 2.7 billion years ago—photosynthesizing bacteria evolved. They released oxygen into the atmosphere via photosynthesis and, in a few hundred million years, were able to change the composition of the atmosphere into what we have today.
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