Simulations Suggest Early Earth Gained a Habitable Window for Prebiotic Chemistry
A 3D model simulated how impacts heated Earth's crust from 4.5 to 3.5 billion years ago. It indicates global sterilization events persisted until about 4.4 billion years ago, with a possible stable interval around 4.33 billion years ago. The same impacts may have created hydrothermal settings where water, heat, and chemical energy could support early RNA-like chemistry.
A three-dimensional simulation followed crustal heating from asteroid and comet strikes across a billion-year span. It suggests worldwide sterilizing heat persisted until roughly 4.4 billion years ago, after which some regions stayed below 110°C and were never reheated. A possible stable interval appears near 4.33 billion years ago.
The model also links those same collisions to hydrothermal systems in fractured, hot rock, where water, warmth, and chemical energy might have supported RNA-like reactions. Researchers constrained bombardment using lunar cratering and highly siderophile elements, and compared thermal limits for fragile biomolecules.
This research may shape how scientists and educators discuss life's origins, potentially influencing public interest in astrobiology and planetary science. It could inform searches for habitable environments on other worlds and help museums, media, and classrooms present early Earth as less uniformly hostile. For general audiences, it may deepen curiosity about whether life's chemistry required rare calm intervals.