Early Mars atmosphere ‘oxygen-rich’ – BBC News

BBC News
Early Mars atmosphere 'oxygen-rich'
BBC News
Mars' atmosphere could have been rich in oxygen four billion years ago – well before Earth's air became augmented with the gas. That is the suggestion put forward by the author of a study in Nature journal, which outlines an explanation for differences 
Mars had an oxygen-rich atmosphere four billion years agoThe Guardian
Mars had oxygen-rich atmosphere a billion years before EarthTelegraph.co.uk
Mars was oxygen-rich billion years before EarthBusiness Standard
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