Self-imposed climate change may have killed Martian life

Hungry microbes blamed for chilling out the party too much

, gulping CO2 and H2 and expelling methane, the researchers found an effect akin to, but opposite from, Earth's warming climate: Mars froze instead.

"According to our results, Mars' atmosphere would have been completely changed by biological activity very rapidly, within a few tens or hundreds of thousands of years," said Dr Boris Sauterey, co-author of the research which wasin Nature."By removing hydrogen from the atmosphere, microbes would have dramatically cooled down the planet's climate."

Researchers at the University of Arizona, The Sorbonne, and several other French institutions say their climate models show that Mars during the Noachian era could have seen as much biomass productivity as early Earth oceans, where life was plentiful.Space.com, Mars' temperature may have spanned between -10 and 20 degrees Celsius ,"But its atmosphere was quite different from that of Earth.

"And the answer is, generally speaking, yes, these microbes could have made a living in the planet's crust," Ferrière said. The team further found that Martian microbes would have been happiest"in the upper few hundred meters" of dirt.

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