Researchers at the University of Washington built a computer simulation of Earth without biology according to The Times of India.
The work tracks chemical movement across Earth’s layers over billions of years. The research appeared on September 18, 2026, in The Planetary Science Journal under the title A Whole-planet Model of the Earth without Life for Terrestrial Exoplanet Studies
, and was reported by The Times of India.
The quest to discover extraterrestrial life faces a persistent challenge: distinguishing between gases produced by biological metabolism and those created by geological forces such as volcanic activity and atmospheric chemistry noted by XenoSpectrum. Without a validated baseline for what a dead planet can produce, detecting a gas like methane or carbon dioxide can lead to false positives, a credibility risk that has accompanied tentative biosignature claims detailed by Tech Times.
Lead author Samantha Gilbert-Janizek was a Ph.D. student at the University of Washington when the research was conducted. She is now a postdoctoral fellow at the University of California, Riverside. Gilbert-Janizek built upon a model previously developed by Washington’s Rory Barnes according to Space.
While Barnes’s earlier model simulated a planet’s core, mantle, and crust, Gilbert-Janizek pushed the simulation further by incorporating the surface and atmosphere stated by Space. The entire framework is built on the VPlanet code platform developed at the University of Washington reported by Tech Times.
The model simulates 19 non-biological planetary properties, including stellar heat received, core-to-surface chemical exchange, and subsurface gas outflows noted by Space. Testing the simulation against real-world benchmarks yielded high accuracy. 17 of 19 benchmarks matched within their margin of error, while the remaining two differed by only about two standard deviations reported by XenoSpectrum.
Specifically, the calculated mean surface temperature reached 286.9 K, matching pre-industrial estimates of 286.9 ± 0.1 K, and atmospheric carbon dioxide partial pressure hit 28.2 Pa compared to a target of 28.4 ± 0.4 Pa stated by XenoSpectrum. Upper mantle heat flow was calculated at 38 TW, aligning with the 38 ± 3 TW target noted by XenoSpectrum.
Gilbert-Janizek ran the simulation starting approximately 50 million years after Earth’s formation up to 5 billion years after formation, reaching roughly 500 million years into the future reported by Space and XenoSpectrum. The resulting lifeless world maintained oceans and an atmosphere according to Space.
Synthetic spectra generated from the model showed clear water vapor and carbon dioxide absorption bands, but lacked the oxygen, ozone, and notable methane absorption features characteristic of present-day Earth stated by XenoSpectrum.
Due to its plug-and-play nature, researchers can input bulk properties of rocky exoplanets into the model reported by Space. If spectroscopic observations from instruments like the James Webb Space Telescope, upcoming extremely large 30-meter-plus ground-based telescopes, or NASA’s planned Habitable Worlds Observatory match the lifeless simulation, the target world likely lacks biological life noted by Space and Tech Times.
Conversely, discrepancies between observations and the lifeless model indicate a candidate worth pursuing for follow-up studies stated by Space, matching the 5 billion years of evolution tracked in the model.
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