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   How did life start on Earth?

   • Here are 3 popular theories. The first signs of microbial life emerged around 3.5 billion years ago. Scientists think early life may have formed from lighting strikes or arisen in deep sea vents. How did life on Earth begin? Here are 3 popular theories. For millions of years, Earth was a hot and rocky planet.

   How did life on Earth begin? Here are 3 popular theories

   www.nationalgeographic.com/science/article/early-life-earth-theories

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   How long ago was life found on Earth?

   • Structures of communities of microorganisms, layered rocks called stromatolites, are found from more than three billion years ago. Since Earth is about 4.6 billion years old, these finds suggest that the origin of life must have occurred within a few hundred million years of that time.

   Evolution and the history of life on Earth - Encyclopedia Britannica

   www.britannica.com/science/life/Evolution-and-the-history-of-life-on-Earth

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   How long did life last on Earth?

   • Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, however, are only 3.7 billion years old. During that 600 million-year window, life may have emerged repeatedly, only to be snuffed out by catastrophic collisions with asteroids and comets.

   The origin of life on Earth, explained - University of Chicago News

   news.uchicago.edu/explainer/origin-life-earth-explained

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   Where did life come from?

   • Some hints come from the oldest zircons, highly durable minerals that formed in magma. Scientists have found traces of a form of carbon—an important element in living organisms— in one such 4.1 billion-year-old zircon. However, it does not provide enough evidence to prove life’s existence at that early date. Where did life on Earth begin?

   The origin of life on Earth, explained - University of Chicago News

   news.uchicago.edu/explainer/origin-life-earth-explained

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   Why did life end on Earth?

   • “The reason it ended with life on Earth is in the details: How planets formed out of the rotating disk of dense gas surrounding a newly formed star, the relationship to the whole system – the star, the other planets around it – that made Earth habitable and supported the emergence and evolution of life.”

   Beginnings: Life on Our World and Others - NASA Science

   science.nasa.gov/universe/search-for-life/beginnings-life-on-our-world-and-others/

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   Did life come from a hot and rocky planet?

   • “And the answer is that it didn't. It happened step by step by step.” For millions of years, Earth was a hot and rocky planet. Scientists have some hypotheses on how life emerged amid such inhospitable terrain.

   How did life on Earth begin? Here are 3 popular theories

   www.nationalgeographic.com/science/article/early-life-earth-theories

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2. news.uchicago.edu › explainer › origin-life-earthThe origin of life on Earth, explained | University of ...

   news.uchicago.edu › explainer › origin-life-earth

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   Sep 19, 2022 · When did life on Earth begin? Earth is about 4.5 billion years old. Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. The oldest known fossils, however, are only 3.7 billion years old.

3. en.wikipedia.org › wiki › History_of_lifeHistory of life - Wikipedia

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   Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.

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5. www.nationalgeographic.com › science › articleHow did life on Earth begin? Here are 3 popular theories.

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   Mar 8, 2024 · Here are 3 popular theories. The first signs of microbial life emerged around 3.5 billion years ago. Scientists think early life may have formed from lighting strikes or arisen in deep...

6. www.britannica.com › science › lifeLife - Evolution, History, Earth | Britannica

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   Oct 25, 2024 · The evidence is overwhelming that all life on Earth has evolved from common ancestors in an unbroken chain since its origin. Darwin’s principle of evolution is summarized by the following facts.

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     Where Did Life Come From? (feat. PBS Space Time and Eons!)

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     A Timeline of Life on Earth: 4 Billion Years of History

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     Evolutionary History: The Timeline of Life: Crash Course Biology #16

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8. www.nature.com › articles › d41586/018/05098-wHow Did Life Begin? - Nature

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   May 9, 2018 · Is the existence of life on Earth a lucky fluke or an inevitable consequence of the laws of nature? Is it simple for life to emerge on a newly formed planet, or is it the virtually...

   • Author: Jack Szostak

   • Publish Year: 2018

9. science.nasa.gov › universe › search-for-lifeBeginnings: Life on Our World and Others - NASA Science

   science.nasa.gov › universe › search-for-life

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   Jun 13, 2023 · How Did Earth End Up With Life? Much of NASA’s astrobiology research, studying the origins and requirements of life in the cosmos, begins right here at home. And it goes all the way back to the birth of our star, the Sun, inside a swirling cloud of gas and dust.

10. www.sciencealert.com › scientists-reveal-how-theyScientists Reveal How They Identified The Ancestor of All ...

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    Aug 16, 2024 · Over 600 million years ago, the common ancestor of all animals emerged – the microscopic urmetazoan. Billions of years before all of that happened, however, the common ancestor of all living organisms, the last universal common ancestor (Luca), must have existed.