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American Focus > Blog > Tech and Science > NASA Discovery Could Explain Why We’ve Never Found Life on Mars : ScienceAlert
Tech and Science

NASA Discovery Could Explain Why We’ve Never Found Life on Mars : ScienceAlert

Last updated: July 5, 2025 9:45 am
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NASA Discovery Could Explain Why We’ve Never Found Life on Mars : ScienceAlert
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Why Mars is Barren and Uninhabitable Compared to Earth

Have you ever wondered why Mars, a planet similar to Earth in many ways, is barren and uninhabitable while life thrives on our planet? A recent discovery by a NASA rover sheds light on this mystery, suggesting that while rivers once flowed on Mars, it was destined to become a desert planet.

Although Mars has all the necessary components for life, the lack of liquid water is a crucial missing element. Evidence of ancient rivers and lakes on the Martian surface indicates that water once existed, making Mars our nearest neighbor with potential for habitability.

Recent research has revealed that Mars was not always a desolate planet. NASA’s Curiosity rover found rocks rich in carbonate minerals earlier this year, providing a missing piece to the puzzle of Mars’s past. These carbonate rocks, similar to limestone on Earth, absorb carbon dioxide from the atmosphere, storing it within the rock.


Site where Curiosity found a mineral that may help explain the planet’s fated desolation. (NASA/JPL-Caltech/MSSS)

A new study published in the journal Nature explores how the presence of these carbonate rocks could reshape our understanding of Mars’s history. Lead researcher Edwin Kite suggests that Mars experienced brief periods of habitability, but these were rare exceptions.

On Earth, a climate cycle supported by carbon dioxide in the atmosphere and volcanic activity maintains a balance conducive to life. Mars, however, lacks the volcanic outgassing rate of Earth, resulting in a colder, inhospitable environment.

While Mars may have had brief periods of liquid water, the majority of its history has been a barren desert for over 100 million years. Despite this, there is still a possibility of underground pockets of water on Mars yet to be discovered.

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Searching for Life Beyond Earth

NASA’s Perseverance Rover, which landed on Mars in 2021, has detected signs of carbonates near a dried-up lake, further fueling the investigation into Mars’s past. Scientists are eager to find more evidence of carbonates and are planning to retrieve rock samples from Mars’s surface in the upcoming decade.

Understanding planets like Mars and Earth is crucial in answering the question of how common habitable worlds are in the universe. While astronomers have identified thousands of exoplanets, studying rocks on Mars and Earth provides unique insights into planetary history.

If Mars never hosted life during its more habitable periods, it could suggest that life is rare in the universe. Conversely, evidence of ancient life on Mars would indicate that life can flourish on a planetary scale. The search for answers continues as we explore the mysteries of our neighboring planet.

© Agence France-Presse

TAGGED:DiscoveryExplainLifeMarsNasaScienceAlertWeve
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