BOL models four leading scientific hypotheses for how life may have begun on Earth. Each scenario configures a distinct geochemical environment, energy mix, and molecular starting conditions.
Understanding Origin-of-Life Scenarios
What Are Scenarios?
Each scenario represents a leading scientific hypothesis about how life emerged on early Earth (~3.8–4.1 billion years ago). They differ in energy sources, mineral catalysts, starting molecules, and environmental conditions.
Click a scenario card to see its configuration, then click Launch Simulation to run it on the Dashboard.
Energy Source Tags
- Thermal — Heat from hydrothermal vents or volcanic activity; drives condensation reactions.
- Redox — Chemical energy from electron transfer (e.g., iron-sulfur, H₂ oxidation).
- UV — Ultraviolet radiation from the young Sun; powers photochemistry but can also damage polymers.
- Lightning — Electrical discharge through the atmosphere; produces reactive species like HCN.
What to Look For
- Alkaline Vent tends to produce steady vesicle growth via proton gradient energy.
- Iron-Sulfur favours metabolism-first chemistry with strong redox energy.
- RNA World maximises information polymer (RNA) production.
- Warm Little Pond produces diverse chemistry via wet-dry cycling.
Use the Parameter Sweep page to compare all four side-by-side.
Alkaline Hydrothermal Vent
Proton gradients across microporous mineral walls drive CO₂ fixation and organic synthesis at alkaline hydrothermal vents on the early ocean floor. Based on Russell & Martin's hypothesis.
Iron-Sulfur World
Wächtershäuser's metabolism-first hypothesis: pyrite (FeS₂) surfaces catalyse carbon fixation via redox energy, bootstrapping proto-metabolism before genetic polymers appear.
RNA World
Gilbert's RNA-first scenario: ribozymes serve as both catalysts and information carriers in a mineral-rich pool, enabling self-replication before proteins or DNA.
Warm Little Pond
Damer & Deamer's wet-dry cycling hypothesis: terrestrial hot springs concentrate organics through evaporation, driving polymerization inside lipid vesicles.