Simulation Models Earth's Geochemistry Over 5 Billion Years
University of Washington researchers built a non-biological model of Earth's chemical systems to inform the search for habitable planets.
Updated on Nov. 3, 2026 in Geology
Researchers at the University of Washington published a simulation of Earth's geochemical systems spanning from its formation 4.5 billion years ago to roughly 500 million years in the future. The model omits the influence of life and tracks chemical exchange among the core, mantle, crust, surface, and atmosphere.
Why it matters
Scientists need a non-biological atmospheric baseline to tell habitable planets apart from inhabited ones. With more than 6,000 exoplanets cataloged, a reliable reference model could sharpen how future observations are interpreted.
The model reproduces 19 planetary properties, including mantle heat flow, across a simulated span of 5 billion years. Astronomers have cataloged more than 6,000 planets beyond the solar system, a population the baseline is intended to help interpret.
The players
University of Washington
A public research university in Seattle whose astronomy department produced the simulation.
Samantha Gilbert-Janizek
A UW doctoral astronomy student at the time of the research, now a postdoctoral fellow at UC Riverside.
Rory Barnes
A University of Washington associate professor of astronomy who served as senior author of the study.
The details
Lead author Samantha Gilbert-Janizek, then a University of Washington doctoral student of astronomy, added surface and atmosphere modeling to an existing Earth simulation that previously covered only the core, mantle, crust, and stellar radiation. The paper appeared in The Planetary Science Journal, with senior author Rory Barnes, a UW associate professor of astronomy.
Timeline
4.5 billion years ago: Earth forms, the starting point of the simulation.
Roughly 500 million years in the future: the simulated period ends.
Big Picture
The simulation supplies a non-biological atmospheric baseline that could help calibrate the design of future telescopes such as the proposed Habitable Worlds Observatory. Separating abiotic chemistry from signs of life is central to judging whether distant worlds can support it.
The baseline could eventually help astronomers decide which distant planets deserve the costly telescope time needed to search for biosignatures. For now, the model is a research tool rather than a change to everyday life.
The takeaway
Telling a living planet from a lifeless one requires first knowing what a planet looks like without life. A model that tracks chemistry from formation onward gives scientists that reference point.
Further reading
Explore more Seattle geology coverage to see how Earth's deep-time processes shape the region.
