6a00d8341bf7f753ef00e54f16fe6f8833 800wi

How life began: theories

  • 500 BCE

    The first time they mentioned the "Creationist theory"

    The first time they mentioned the "Creationist theory"
    Anaxagoras said that there was an action of a nous (an intelligence) and this was the first record of Creationist. Nowadays we know that a lot of religious people tried to fit this theory in every religion and that some people even wrote books about it like John Ray and his books. The definition of this theory is: Everything was created by God.
  • 500 BCE

    The first time "Panspermia" was proposed

    The first time "Panspermia" was proposed
    Anaxagoras thought that things they existed in infinitesimally small fragments of themselves, endless in number and inextricably combined. He was proved wrong many times but some times some scientists (even Nobel prize winners) proved he had a point. The theory goes: the seeds of life are constantly traveling through space.
  • Period: 500 BCE to

    Panspermia theory discovery

    The first guy to talk about it was Anaxagoras (again) and it passed through many people who thought he was wrong but some others thought he had a lot of good proposals. The las guy to say something about it was Nobel prize winner Professor Francis Crick, who established the "directed panspermia".
  • Period: 500 BCE to

    Creationist theory discovery

    The first two people that started with this theory were Empedocles and Anaxagoras in the 5th century BC. Then the theory started its changes because of many religions and beliefs, and the last record they have about creationist is from 2012, Bill Nye, expressed his opinion based in facts.
  • 360 BCE

    The first time "Biogenesis" was expressed

    The first time "Biogenesis" was expressed
    Aristotle was the first guy to ever mention this contrary of Spontaneous Generation, he stated that life came from things with life. Then a lot of guys tried to prove it but until Louis Pasteur came, none could explain. Biogenesis is basically the same as S.G but this theory is: All life comes from life.
  • Period: 360 BCE to

    Biogenesis theory discovery

    Aristotle thought that spontaneous generation may have been wrong, but life still came from things like soil. William Harvey then came and stated that early proponent of all life begins from an egg, omne vivum ex ovo, many experiments were made but none of them could completely tell that Biogenesis was right. And finally, Louis Pasteur revealed his experiments and demonstrated that life does not arise in areas that have not been contaminated by existing life
  • 300 BCE

    The first time "Spontaneous Generation" was thought

    The first time "Spontaneous Generation" was thought
    Anaximander claimed that living creatures were first formed in the "wet" when acted on by the Sun. That was the first mention ever of Spontaneous Generation, now we know that it actually is when life comes from non-living matter.
  • Period: 300 BCE to

    Spontaneous Generation theory discovery

    It was first thought by Anaximander, then some of his pupils tried to put more work in it and Aristoteles came in. A lot of people gave new ideas to it, new experiments but the last one to do something significative was Louis Pasteur proving the theory with a meat experiment.
  • The first time the "Endosymbiotic theory" was articulated

    The first time the "Endosymbiotic theory" was articulated
    Konstantin Mereschowsky was the first guy to think about this, after being close to some experiments with chloroplast and who had himself tentatively proposed that green plants had arisen from a symbiotic union of two organisms. Then many guys followed until we got some explanations, the theory explains the origin of chloroplast and mitochondria, then following the origin of plants, for example.
  • Period: to

    Endosymbiotic theory discovery

    The first guy who proposed this idea was Konstantin Mereschowsky, a botanist who was familiar with a work about chloroplast. Then, after that, many scientists published books about this theory and introduced the mitochondria to the theory. The last guy to make a complete proposal, including almost all of this ideas was, Christian de Duve, but sadly, it did not receive a lot of acceptance.
  • The first time they came up with "Physical-Chemical"

    The first time they came up with "Physical-Chemical"
    A.I Oparin was the first human ever to think about combining Physics and Chemistry to create this proposal that contradicted Spontaneous Generation. He proposed that the molecules formed colloid aggregates, or 'coacervates', in an aqueous environment. And then Haldane came and wrote some new things but with Ocarina's ideas.
    Now we know that the theory is this one: The first amino acids were created in a primitive atmosphere.
  • Period: to

    Physical-chemical theory discovery

    Two guys proposed the theory. The first one was: A.I Oparin and the second one was: J.B.S Haldane. Both theories were similar, and Haldane actually got inspired after Ocarina's book got translated to English.