Scientists simulate an Earth without life to help hunt for aliens and inhabited worlds

Astronomers at Princeton University have developed a computer simulation of a lifeless Earth to aid in the search for potentially habitable exoplanets. The research team focused on simulating atmospheric evolution over billions of years when no biological processes exist. This allows scientists to identify key differences between barren and inhabited rocky planets by analyzing their atmospheric compositions. Specifically, the models examine how gases like carbon dioxide and water vapor would accumulate or dissipate without any organisms to regulate them. Researchers believe this approach will significantly improve our ability to detect signs of life beyond Earth, prioritizing targets with atmospheres resembling those predicted for living worlds.