How Earth Would Look Without Life According to New Simulation

Earth would maintain surface temperatures and oceans without life, according to a computer model published on 18 September 2026 in The Planetary Science Journal.

Researchers built the geochemical system to test whether rocky worlds need biology to stay habitable over billions of years. The findings help astronomers evaluate atmospheric signatures on distant exoplanets.

Space telescopes will target thousands of candidate worlds in search of biosignatures. Distinguishing living planets from non-living ones requires knowing what an abiotic world looks like.

“When we interpret observations of an exoplanet’s atmosphere, this tool will help us determine the probability that what we observe indicates life on the surface,” said Samantha Gilbert-Janizek, an astronomer at UC Riverside, in a statement reported by Futurism.

The University of Washington research group incorporated 19 non-biological properties into the software. The simulation tracks core, mantle, crust, ocean, and atmospheric evolution over five billion years, as Space noted.

Gilbert-Janizek built upon earlier framework developed by Rory Barnes at the University of Washington. That predecessor focused strictly on interiors, while the new version pushes two steps further to cover surface chemistry and gas exchange.

“Nobody had created a model that fully simulated Earth’s habitability by considering the whole planet,” Gilbert-Janizek told IFLScience.

The simulation ran from Earth’s formation 4.5 billion years ago up to 500 million years in the future. The virtual planet kept comfortable surface temperatures and stable water volumes throughout the run.

The absence of atmospheric oxygen remained the most striking deviation from the real Earth. Cyanobacteria pumped oxygen into the air around three billion years ago, a shift requiring biological intervention as ScienceAlert reported.

“This work thus contributes to the ongoing debate regarding the Gaia hypothesis by suggesting that life and habitability may be somewhat decoupled,” the researchers concluded in the study.

Researchers plan to apply the software to targets observed by upcoming instruments like NASA’s Habitable Worlds Observatory. The tool operates as a plug-and-play system for bulk planetary parameters.

Planets whose actual atmospheres match the lifeless model likely lack biology. Worlds displaying anomalies that defy the simulation warrant deeper investigation by ground-based observatories or the James Webb Space Telescope.

“If we can create a model that recreates Earth with some fidelity, then we can try to apply it to simulating the exoplanets we hope to find in the future,” Gilbert-Janizek told IFLScience.

NASA funded the research work, as reported by The News International.

Barnes says the model’s calibration against Earth gives the team confidence in future exoplanet simulations.

More on this story: University of Washington Researchers Simulate Lifeless Earth Scenario

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