Monday , June 27 2022

They locate the region of Mars most appropriate for the existence of life



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If living organisms have existed on the red planet, they must have lived in subglacial lakes when their surface was covered with ice, and later subsoil.

The most appropriate zone for life on Mars could be located several kilometers below its surface, say the authors of a study published Wednesday in the journal Science Advances.

The hypothesis is related to the call the paradox of the young and weak Sun.. Astrophysics has determined that our star’s luminosity 4 billion years ago was 30% lower than it is today. Under such conditions, not only Mars or Earth but Earth as well covered with permanent ice, and yet on both planets there is evidence of the the existence of liquid water at the time.

A Martian meteorite found in the Sahara reveals evidence of water on the red planet 4.4 billion years ago

To resolve the contradiction between geological data and climate models, the researchers assumed that it did between 4,100 and 3,700 million years the red planet was covered by a layer of ice several kilometers thick, which existed beneath it subglaciales lagos. As in different places on Earth, on planet Mars liquid water may have existed thanks to geothermal heat of the planet’s bowels, scientists say.

Unlike the Earth, which has a greater mass and magnetic field, the conditions on Mars did not favor preserving the atmosphere, so that surface water was supposed to evaporate and disappear into space. As a result, liquid water could only have been stored at a considerable depth. And that’s where the Martian life should be looked for, the study’s authors suggest.

“If it ever originated yes on mars afterwards he may have followed the water table to increasingly gradient depths, where stable liquid water could persist […] At those depths, life could have been is sustained by hydrothermal activity and rock water reactions […] reminds someone of ecosystems that exist kilometers deep on Earth, “they conclude.

Clues to look for remnants of life on Mars in Chile

As for the depth of the Martian water table, the researchers stick to previous estimates, which place it in it approximately 8.5 km.

In a comment quoted by Rutgers University, the work’s lead author, Lujendra Ojha, highlighted the importance of her hypothesis for the study of the red planet: “The subsurface may represent the longest living environment on Mars“.

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