A Planet, blue and green, a billion people life in there. This is "Earth", our planet
Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating and other sources of evidence, Earth...
Late Heavy Bombardment ends. After 300 million yers of increased asteorid collisions, the rate of impacts decreases.
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Asteorid collision
3,770 Ma:
Evidence of Biology. The ratio betwen carbon-13 and carbon-12 is found in graphite in Greenland from this time is evidence for life. Life generally prefers carbon-12 over carbon-13 because it is easier to transport the lighter carbon-12
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Carbon-12,-13
3,700 Ma:
Oldest unconfirmed stromatolites. There is dispute the structure are truly stromatolites. They are found in the Isua Greenstone Belt
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Stromatolites
First banded iron formations. also called oxygen sinks, BIFs, for short, form as a result of free oxygen in the atmosphere that react with dissolved iron in the oceans, rusting the iron and causing it to precipitate into layers.
3,650 Ma:
Last Universal Common Ancestor develops. LUCA, for short, lived at this time and is ancestor to all forms to life foubd today. It is believed to have used 20 left-handed amino acids. All other life contemporary with LUCA eventually became extinct.
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Last Universal Common Ancestor (LUCA)
3,500 Ma:
Fist Archaea. The evolutionary lines of archaea and bacteria split around this time.
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Archaea
First Cyanobacteria. Cyanobacteria may have evolved already by this time, Being only prokaryotes to undergo oxygenic photosynthetis, they were the first oranisms to introduce oxygen into the Earth's atmosphere. This process produced orders of magnitude more energy than anaerobuc processes.
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Cyanobacteria
Earliest undisputed appareance of life. The oldest microfossils date to this time.
