Mars once had an atmosphere that was thicker than Earth's today

New ScientistMonday, September 15, 2025 at 6:00:37 PM
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Mars once had an atmosphere that was thicker than Earth's today
Mars may have once had a much thicker atmosphere than it does today, potentially hundreds of times denser with a pressure three times that of Earth.
Editor’s Note: Understanding Mars' past atmosphere is crucial for scientists studying the planet's climate history and its potential for supporting life.
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