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Earliest Life on Mars Could Have Self-Destructed in a Climate Catastrophe : ScienceAlert

unfoldingmatrix by unfoldingmatrix
October 13, 2022
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Ancient microbial life on Mars could have destroyed the planet’s atmosphere through climate change, which ultimately led to its extinction, new research has suggested.

The new theory comes from a climate modeling study that simulated hydrogen-consuming, methane-producing microbes living on Mars roughly 3.7 billion years ago. At the time, atmospheric conditions were similar to those that existed on ancient Earth during the same period.

But instead of creating an environment that would help them thrive and evolve, as happened on Earth, Martian microbes may have doomed themselves just as they were getting started, according to the study published October 10 in the journal Nature Astronomy.

The model suggests that the reason life thrived on Earth and was doomed on Mars is because of the gas compositions of the two planets, and their relative distances from the Sun. Being farther away from our star than Earth, Mars was more reliant on a potent fog of heat-trapping greenhouse gases, such as carbon dioxide and hydrogen, to maintain hospitable temperatures for life.

So as ancient Martian microbes ate hydrogen (a potent greenhouse gas) and produced methane (a significant greenhouse gas on Earth but less potent than hydrogen) they slowly ate into their planet’s heat-trapping blanket, eventually making Mars so cold that it could no longer evolve complex life.

Related: Curiosity rover discovers that evidence of past life on Mars may have been erased

As Martian surface temperatures dropped from a tolerable range between 68 and 14 degrees (10 to 20 degrees Celsius) Fahrenheit to a punishing minus 70° F (minus 57° C), the microbes fled deeper and deeper into the warmer crust of the planet – burrowing more than 0.6 mile (1 kilometer) deep only a few hundred million years after the cooling event.

To find evidence for their theory, the researchers want to find out if any of these ancient microbes survived. Traces of methane have been detected on Mars’ sparse atmosphere by satellites, as well as in the form of ‘alien burps’ spotted by NASA’s Curiosity rover, which could be evidence that the microbes still exist.

The scientists believe their findings suggest that life may not be innately self-sustaining in every conducive environment it pops up in, and that it can easily wipe itself out by accidentally destroying the foundations for its own existence.

“The ingredients of life are everywhere in the Universe,” study lead author Boris Sauterey, an astrobiologist at the Institut de Biologie de l’Ecole Normale Supérieure in Paris, France told Space.com.

“So it’s possible that life appears regularly in the Universe. But the inability of life to maintain habitable conditions on the surface of the planet makes it go extinct very fast. Our experiment takes it even a step farther as it shows that even a very primitive biosphere can have a completely self-destructive effect.”

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This article was originally published by Live Science. Read the original article here.



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