what happened a billion years ago ?

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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
The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet’s obligate anaerobes. Researchers have identified five other major extinction events in Earth’s history, with estimated losses below: [11] End Ordovician: 440 million years ago, 86% of all species lost, including graptolites

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

https://en.wikipedia.org/wiki/History_of_Earth
History of Earth – Wikipedia
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.

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
Mathematics Chemistry Subscribe now Life Timeline: The evolution of life The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth…

https://evolution.berkeley.edu/evolution-101/the-history-of-life-looking-at-the-patterns/how-we-know-what-happened-when

https://evolution.berkeley.edu/evolution-101/the-history-of-life-looking-at-the-patterns/how-we-know-what-happened-when
How we know what happened when – Understanding Evolution
Important events in the history of life Life began 3.8 billion years ago, and insects diversified 290 million years ago, but the human and chimpanzee lineages diverged only five million years ago. How have scientists figured out the dates of long past evolutionary events?

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.britannica.com/science/geologic-time

https://www.britannica.com/science/geologic-time
Geologic time | Periods, Time Scale, & Facts | Britannica
5 nov. 2023Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).

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

https://en.wikipedia.org/wiki/Chronology_of_the_universe
Chronology of the universe – Wikipedia
Research published in 2015 estimates the earliest stages of the universe’s existence as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level. [1] Outline Chronology in five stages

https://www.pbs.org/wgbh/nova/article/the-history-of-earth-in-five-epic-chapters

https://www.pbs.org/wgbh/nova/article/the-history-of-earth-in-five-epic-chapters
The History of Earth in Five Epic Chapters | NOVA | PBS
Il y a 2 joursDive into the most dramatic events in Earth’s 4.5-billion-year history, from its birth to the emergence of humanity. … 252 million years ago, a devastating mass extinction wiped out about 90% …

https://www.iop.org/explore-physics/big-ideas-physics/big-bang

https://www.iop.org/explore-physics/big-ideas-physics/big-bang
The big bang | Institute of Physics
How do we know the big bang happened 13.8 billion years ago? A. Despite having little to go on, in 1922 Alexander Friedmann used Albert Einstein’s relativity to estimate the universe’s age as 10 billion years. Today, scientists follow the same technique but plug in the actual expansion rate of the universe – a number known as the Hubble …

https://www.nationalgeographic.com/science/article/moon-forming-collision-theia-left-chunks-deep-within-earth-mantle

https://www.nationalgeographic.com/science/article/moon-forming-collision-theia-left-chunks-deep-within-earth-mantle
4.5 billion years ago, another planet crashed into Earth. We may have …
1 nov. 2023Some 4.5 billion years ago, the solar system was a giant game of cosmic pinball. During those early ages, a planetary body the size of Mars slammed into the still-forming Earth. lesoutrali bot