Mars once had a moderately dense atmosphere

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Mars once had a moderately dense atmosphere

November 28, 2015
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Scientists suggest that 3.8 billion years ago, Mars might have had only a moderately dense atmosphere. The scientists have identified a photochemical process that could have helped such an early atmosphere evolve into the current thin one without creating the problem of 'missing' carbon and in a way that is consistent with existing carbon isotopic measurements.

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