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Discovery made in Gale crater reveals compounds preserved for billions of years and expands scientific understanding of Mars’ past
A significant scientific discovery has been recorded on Mars, simultaneously reinforcing the debate about the habitability of the red planet.
Furthermore, NASA’s Curiosity rover identified over 20 organic molecules in the Martian soil, according to results published on January 21 in the journal Nature Communications
These compounds are considered fundamental because, on one hand, they are linked to the origin of life on Earth, and on the other, they indicate that Mars had favorable environmental conditions in the past.
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Thus, although the discovery does not confirm life, it indicates that the essential ingredients for its existence were present.
Discovery reinforces favorable environmental conditions on Mars
Firstly, the unprecedented chemical experiment was conducted in 2020, in the Glen Torridon region, within Gale crater.
In this regard, the collected data show that the Martian surface can preserve organic compounds over billions of years.
Furthermore, these substances were found in clay-rich sandstones, with an estimated age of about 3.5 billion years.
Therefore, this type of environment is considered ideal for preserving organic matter, even in the face of radiation and geological transformations.
Investigation reveals molecules linked to the basis of life
Among the identified compounds, Curiosity detected nitrogen heterocycles, which are fundamental for the formation of DNA and RNA.
Furthermore, a nitrogenous molecule with a structure similar to DNA precursors was identified, something unprecedented on Mars.
Benzothiophene was also found, a sulfur-containing substance with a two-ring structure, often associated with the arrival of meteorites.
Thus, according to the University of Florida, these substances may have both internal and external origins to the planet.
Origin of compounds still generates scientific debate
However, despite the relevance of the data, the experiment cannot differentiate the origin of the molecules.
Thus, scientists evaluate that the compounds may have been generated by abiotic processes, without the presence of life.
Furthermore, there is a possibility that they were brought by meteorites, which expands the field of investigation.
Therefore, to confirm any biological evidence, it would be necessary to analyze samples directly on Earth.
Curiosity Mission investigates Mars since 2012
The Curiosity rover was launched in 2011 and landed on Mars in 2012, as part of the Mars Science Laboratory mission, led by NASA’s Jet Propulsion Laboratory.
Since then, the robot’s objective has been to answer whether Mars ever presented conditions to sustain microbial life.
So far, chemical and mineral evidence of habitable environments in the past has been identified, reinforcing the mission’s role.
Importance of organic matter for science
According to Amy Williams, mission scientist and professor at the University of Florida, the presence of preserved organic matter is essential for evaluating habitability.
Furthermore, she highlights that these compounds show that it is possible to find ancient organic carbon on Mars.
Thus, the discovery strengthens scientific investigations, even without confirming the existence of life.
Did Mars ever have life?
Finally, although data indicates that Mars possessed the necessary elements for life, there is no confirmation of living organisms in the past.
Nevertheless, samples were collected in areas indicating ancient lakes and rivers, environments considered ideal for sustaining life.
Therefore, in light of this scientific evidence, a central question arises: if Mars had the right ingredients, why haven’t we yet found direct signs of life on the planet?
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