Origins of Life & Prebiotic Chemistry: Physical Mechanisms

Key ingredients include organic molecules, energy sources, solvents such as liquid water, concentration mechanisms, catalytic surfaces or molecules, compartment formation, and information-bearing chemical systems. Competing hypotheses emphasize different environments, including hydrothermal systems, surface pools, ice, or mineral interfaces.

Simple molecules can undergo energy-driven reactions that build more complex organics. Amphiphilic molecules can self-assemble into membranes, and some RNA molecules can store information and catalyze reactions, motivating RNA-world models. The transition from chemistry to Darwinian evolution remains unresolved.

Organic molecules form naturally in interstellar space, meteorites, laboratory simulations, and planetary environments. Experiments demonstrate abiotic synthesis of amino acids, nucleobases, lipids, and reaction networks under selected conditions, but they do not recreate the full historical origin of life.

Energy-driven chemistry can build complex molecules; amphiphiles self-assemble into membranes; RNA can both store information and catalyze reactions. The unsolved challenge is integrating these capabilities into a replicating evolving system.