Science & Tech · Science & Environment · 2 hrs ago
Lifeless Earth model could help identify signs of life on exoplanets
Researchers at the University of Washington modeled Earth evolving without life to help astronomers interpret distant planets.
The simulation follows chemical exchanges among a planet’s interior, surface and atmosphere over billions of years.
It reproduced 19 properties of Earth, including atmospheric gases, surface temperature and heat flow through the mantle.
This matters because gases that may suggest life can also arise from natural geological processes.
The model gives scientists a lifeless baseline to compare with observations of rocky exoplanets and test whether geology alone could explain their atmospheres.
If the model cannot explain a planet’s observed signals, that world could be a more promising target for further study, but this work has not detected life elsewhere.
Future telescopes such as the Habitable Worlds Observatory could use the approach when studying planets around other stars.
Researchers at the University of Washington built a model of Earth without life to help scientists interpret signs of life on distant planets.
The simulation models chemical exchanges among Earth’s interior, surface and atmosphere over billions of years.
It reproduces 19 observed properties of preindustrial Earth, including atmospheric gases, surface temperature and mantle heat flow.
Scientists can use the model to test whether an exoplanet’s atmosphere could be explained by geology rather than biology.
The work could help future telescopes, including NASA’s proposed Habitable Worlds Observatory, assess rocky planets around other stars.
- Who
- Researchers at the University of Washington, led by Samantha Gilbert-Janizek.
- What
- They developed a model of Earth’s evolution without life. It could help distinguish biological signals from non-biological processes on exoplanets.
- When
- The study was published in 2026. The model covers Earth’s evolution from 50 million years to 5 billion years.
- Where
- The University of Washington developed the model. It is intended to help study rocky exoplanets around other stars.
- Why
- To help scientists determine whether atmospheric signals on exoplanets could arise from geology or might indicate life.
This story does not have two clearly opposing sides.
Earth formed, and the model simulates its geochemical evolution from 50 million years after formation.
The model reproduces 19 key observations of preindustrial Earth within estimated measurement uncertainties.
The simulation extends its model of Earth’s geochemical evolution to this period.
Interesting Engineering reported on the virtual lifeless Earth model.
Universe Today reported on the study.
- Study
- A Whole-planet Model of the Earth without Life for Terrestrial Exoplanet Studies
- Lead author
- Samantha Gilbert-Janizek
- Model span
- 50 million years to 5 billion years
- Reproduced properties
- 19
- Simulated spectra
- 0.2–2.0 micrometres
- Future observatory
- Habitable Worlds Observatory (HWO)
2 sources
What people are saying
This model can help us see how habitable but non-living planets might mimic living planets
Future telescopes like the Habitable Worlds Observatory (HWO) will soon look for life on rocky worlds around Sun-like stars, so it is critical that we understand how to distinguish habitable planets from inhabited planets.