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  2. History of life - Wikipedia

    en.wikipedia.org/wiki/History_of_life

    The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. 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 ...

  3. Rare Earth: Why Complex Life Is Uncommon in the Universe

    en.wikipedia.org/wiki/Rare_Earth:_Why_Complex...

    Rare Earth was succeeded in 2003 by the follow-on book The Life and Death of Planet Earth: How the New Science of Astrobiology Charts the Ultimate Fate of our World, also by Ward and Brownlee, which talks about the Earth's long-term future and eventual demise under a warming and expanding Sun, showing readers the concept that planets like Earth ...

  4. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    The definition of life has long been a challenge for scientists and philosophers. [2] [3] [4] This is partially because life is a process, not a substance. [5] [6] [7] This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth.

  5. Panspermia - Wikipedia

    en.wikipedia.org/wiki/Panspermia

    In this way, panspermia studies concentrate not on how life began but on methods that may distribute it within the Universe. [10] [11] [12] This point is often used as a criticism of the theory. Panspermia is a fringe theory with little support amongst mainstream scientists. [13]

  6. Timeline of the evolutionary history of life - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the...

    The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.

  7. New details on a mysterious Milky Way region called ‘The ...

    www.aol.com/brick-center-galaxy-unexpected...

    A box-shaped cloud of opaque dust that lies at the center of our galaxy has long perplexed scientists, and observations that reveal a new detail about its composition are deepening the mystery ...

  8. History of research into the origin of life - Wikipedia

    en.wikipedia.org/wiki/History_of_research_into...

    Today, scientists agree that all current life descends from earlier life, which has become progressively more complex and diverse through Charles Darwin's mechanism of evolution by natural selection. Darwin wrote to J.D. Hooker on 29 March 1863 stating that "It is mere rubbish, thinking at present of the origin of life; one might as well think ...

  9. Rethinking the 5-Paragraph Essay in the Age of AI - AOL

    www.aol.com/news/rethinking-5-paragraph-essay...

    The five-paragraph essay is a mainstay of high school writing instruction, designed to teach students how to compose a simple thesis and defend it in a methodical, easily graded package.

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