• Question: How do you believe life started? (E.g. Big Bang theory)

    Asked by Alita to Oliver, Jordan, David on 15 Mar 2019.
    • Photo: David Sünderhauf

      David Sünderhauf answered on 15 Mar 2019:

      I love this question! The Big Bang theory describes how the universe started, and how matter & particles came into existence. These then formed stars & later planets, including planet earth.
      The start of life itself came in what was known as chemical evolution: on early earth, there would have been plenty of molecules floating about, some more complex than others, constantly colliding and forming new molecules. At some point probably, by chance, a molecule appeared that could make a copy of itself (this would have been a precursor of DNA or RNA). As soon as this happened, evolution could start happening: by natural selection, the molecules that were better at making copies of themselves would survive, eventually leading to formation of more complex chains and bigger molecules.
      Eventually, these would have, by chance, packaged themselves into a small lipid droplet and were therefore far more protected from the outside – this would have been the first primitive cell, from which more complex life evolved over billions of years!