Abiogenesis

Abiogenesis is the process by which inorganic elements combine into organic compounds. The Miller-Urey Experiment is a prime example of how such can occur. On Sighsten, abiogenesis would have most probably happened in hydrothermal vents or during thunderstorms near the surface. The energy from the electrical discharges and vents, as well as the variety of elements in the ancient atmosphere and chemical soups, is what would have allowed the first organic molecules to form.

After the first compounds had been created, a chemical evolution would begin. That is to say, molecules that can either resist breaking apart the longest or self-replicate themselves will become more and more prevalent. For example, RNA that can self-replicate will quickly overrun its non-reproductive counterparts. Another example would be lipid bubbles that form naturally as long as there are enough lipid molecules. The bubbles will amass more particles to grow in volume, which reduces their structural integrity. Eventually, the enlarged bubble will split apart into two separate entities. The RNA is brittle but can produce certain compounds, whilst the lipid bubbles are sturdier but don't do much. If these two were to combine, then they would form some of the simplest cells possible. The RNA would be able to produce more of its own, as well as recreate its protective bubble.

Eventually, proteins would also be thrown into the mix, which allows the early organisms to further increase in complexity. Thereby turning what had first been a chemical evolution into a biological one.