A new study in The Planetary Science Journal from researchers at the University of California, Riverside and the University of Washington argues that Earth didn’t need life to stay habitable. Even as a lifeless planet, it could’ve remained fit for liquid water for billions of years instead of sliding into a frozen wasteland or tipping into a Venus-like mess.
Samantha Gilbert-Janizek at the University of California, Riverside led the work with Rory Barnes at the University of Washington. The team modeled about 5 billion years of an Earth-like planet’s history, starting at formation and extending to roughly 500 million years into the future. They ran those simulations using 19 non-biological factors spread across the core, mantle, crust, oceans, and atmosphere.
What held things together in the model was geology. Liquid oceans and stable surface temperatures could last through the carbonate-silicate cycle alone, while the clearest atmospheric feature missing from the picture was oxygen. The study argues that this missing oxygen gives astronomers a cleaner way to separate a planet that’s merely habitable from one that’s actually inhabited. It also gives future exoplanet research a better baseline, including NASA’s proposed Habitable Worlds Observatory and the broader debate around the Gaia hypothesis.
If you follow exoplanet science, this paper is worth your time. You can read it now in The Planetary Science Journal.
Author: Jesús Bosque
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