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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 ...
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.
Starting in 1985, researchers proposed that life arose at hydrothermal vents, [234] [235] that spontaneous chemistry in the Earth's crust driven by rock–water interactions at disequilibrium thermodynamically underpinned life's origin [236] [237] and that the founding lineages of the archaea and bacteria were H 2-dependent autotrophs that used ...
The Origin and Nature of Life on Earth: The Emergence of the Fourth Geosphere (2016) is a book by Eric Smith and biophysicist Harold J. Morowitz which provides an introduction to origins of life research via a review of perspectives from a variety of fields active in this research area, including geochemistry, biochemistry, ecology, and microbiology.
The Earth-Moon system is formed after a giant impact by the hypothetical planetoid Theia A major collision with a Pluto-sized planetoid causes the Martian dichotomy, forming Mars' North Polar Basin. The Sun enters main sequence: solar wind sweeps Earth Moon system clear of debris (mainly dust and gas). 4.5–3.5 Ga: Hadean eon beginning of ...
Nickelback may be part of the reason we have life on Earth. Now, the researchers weren’t just super into late-90s Canadian hard rock—there’s a scientific reason behind the moniker.
Samples of organic matter returned from the asteroid Bennu support the theory that asteroids could have brought the building blocks of life to Earth. Scientists find a 'next step on a pathway to ...
Primordial soup, also known as prebiotic soup, is the hypothetical set of conditions present on the Earth around 3.7 to 4.0 billion years ago. It is an aspect of the heterotrophic theory (also known as the Oparin–Haldane hypothesis) concerning the origin of life, first proposed by Alexander Oparin in 1924, and J. B. S. Haldane in 1929.