If there is life on Mars, it must be considered, because it is also a possible option, there may be life in layers under the surface that preserve liquid water heated by the internal geology of Mars, because the core of Mars is still hot, the core of Mars is smaller than the Earth and therefore it also cooled more quickly, but it still conserves heat and there are pockets of magma.
Permafrost is what frozen ground is called, it is a mixture of rocks, dust and water ice, there is an abundance of permafrost in northern Siberia, northern Alaska, northern Canada for example and there is also it on Mars, what happens is that if there is life on Mars, first if life arose in that ancient time of the noic period, where there was water in abundance and Mars had the same characteristics and elements that the Earth had and also at the same time in which life emerged on Earth.
Surely those microorganisms could have colonized the interior of Mars, in fact, many life forms on Earth live under the Earth and do not have to leave, in millions of years they do not need to leave, if life formed on Mars in the past it is possible that it is underground, but underground deeper than the permafrost, because the permafrost is frozen.
It is possible that layers of liquid water exist and it is investigated because there are photos of recent impacts, of small meteorites of 10 or 20 meters that excavate craters several hundred meters in diameter and that, when breaking the ground, bring to the surface blocks of ice that were under the dusty soil.
The question is whether life had enough time to be created, that is one of the enigmas we have, we do not know at what speed life evolves, in principle yes, life on Earth was only about 400 million years since the planet was formed since the planet was formed, understand since the brutal impact of Tea against the Earth and the Moon was formed, about 400 million years was the same time Mars had water in abundance for about 1000 million years it could have developed perfectly microbial life is more according to the theory of panspermia, that is, that life and the basic elements of life or life itself comes from another point other than space and arrived aboard meteorites or comets.
Mars also had the same possibilities as Earth to receive that type of life, from those original seeds. If life did not emerge on Mars, it is because we are missing some explanation, some very relevant data in terms of understanding how life arose and we could also reach the conclusion that life on Earth is something rarer than we think, but for now we know that Mars had water on the surface for a long time, almost 1 billion years, and the same conditions for life to emerge on Earth.
It was not yet known how Mars managed to have a dense atmosphere, to have that water on the surface, to have a warm climate in a primitive time of the solar system where the sun emitted less heat, and this is where the recent research from the University of Chicago comes in, which is news because there are many times it is suspected, it is theorized, but evidence is needed to confirm and this is the confirmation.
On April 17, this research was published that explains how it is that Mars, many researchers have believed for a long time because there are a lot of remains of seas, beaches, river beds that at some point Mars had a dense atmosphere rich in carbon dioxide, we assume that there was that, but we had no proof, the rocky planets must have that, they must have atmospheres rich in carbon dioxide, Venus has it, the Early Earth had it and Mars right now has it, very weak but Basically the Martian atmosphere is composed of carbon dioxide.
Photosynthesis occurred on Earth and radically changed the atmospheric panorama of the Earth, which was wonderful for all forms of life and the existence of life on Earth, because if we were not now like on Venus, basically with such an incredibly dense atmosphere of CO2, we would have evolved to a planet like Venus, without a doubt and I am convinced that without a doubt Mars in the past had or was supposed to have, but of course we had no proof.
Curiosity has discovered the presence of Siderite which is an iron carbonate mineral and is within sulfate-rich rock layers of Mount Sharf in Gale Crater, the discovery of this mineral in rocks near the surface suggests that in fact the Martian atmosphere was rich in carbon dioxide and very dense, dense enough and rich in carbon dioxide to want a greenhouse effect and have a warm enough climate environment to support the existence of liquid water on the surface of the planet and this is the first time direct evidence of it is found.
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