Scientists Simulated What Earth Would Be Like if Life Never Existed

Scientists have built a simulation of Earth as it would look if life had never emerged, according to coverage from Tech Times, XenoSpectrum, Universe Today, Space, and ScienceAlert. The model is designed to help researchers distinguish genuine signs of life on exoplanets from false positives that could arise on a lifeless planet. Tech Times frames the work as a safeguard against the James Webb Space Telescope raising false alarms about alien life. XenoSpectrum reports that the simulation indicates water could persist on such a lifeless Earth for five billion years. Universe Today describes the virtual planet as a tool to help scientists find life on other worlds. Space characterizes the simulation as supporting the hunt for aliens and inhabited worlds. ScienceAlert presents the project as a reconstruction of what Earth would be like without life. The coverage does not specify which institution or research team developed the model, nor does it state the exact date the simulation was completed. It also does not detail the atmospheric variables or surface conditions included in the virtual planet. The work matters now because the James Webb Space Telescope is actively observing exoplanet atmospheres, and astronomers need reliable benchmarks to interpret potential biosignature gases. Without a lifeless Earth reference, coverage suggests, researchers risk mistaking non-biological processes for evidence of biology. Observers should watch for peer-reviewed publication of the simulation results and for any follow-up studies applying the model to specific exoplanet targets observed by JWST. The coverage does not yet indicate whether the simulation will be made publicly available or integrated into existing exoplanet characterization pipelines.