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Mars: could life itself have made the planet uninhabitable?

By Boris Sauterey, Chercheur en écologie évolutionnaire, écologie marine, et astrobiologie, École normale supérieure (ENS) – PSL

Four billion years ago, the solar system was still young. Almost fully formed, its planets were starting to experience asteroid strikes a little less frequently. Our own planet could have become habitable as long as 3.9 billion years ago, but its primitive biosphere was much different than it is today. Life had not yet invented photosynthesis, which some 500 million years…

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