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An Exoplanet Must Reach at Least 80% of the Earth's Size to Remain Habitable and Maintain Its Atmosphere
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The search for a living exoplanet outside the solar system mobilizes increasingly powerful telescopes. Yet a new theoretical model has just set a precise size threshold. A planet should measure at least 80% of the Earth's radius to keep its gas envelope over billions of years. Yet below this threshold, two physical mechanisms would condemn any potential life. Low gravity and internal cooling condemn small planets The smaller a star, the less its…
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