Why Did Mars Lose Its Habitability While Earth Did Not?

Written by Fabio Lucas Carvalho

Published on 18/07/2025 at 18:06

Updated on 18/07/2025 at 18:07

Foto: Reprodução

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Mars and Earth Began with Similar Conditions, But Took Opposite Paths. One Planet Sustained Life for Billions of Years. The Other Became a Frozen Desert. The Reason? The Way Each Handled Atmospheric Carbon.

Mars and Earth were born with similar characteristics. Both are rocky planets, with water, carbon, and located in potentially habitable regions.

But while Earth maintained a life-sustaining environment, Mars became a cold desert. The difference lies in how each planet dealt with carbon.

The Secret of Earth: Balance of CO₂

On Earth, there is a natural cycle between the absorption and release of carbon dioxide.

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Mars: The Collapse of the Greenhouse Effect

Mars, on the other hand, did not have the same luck. When there was liquid water on its surface, it reacted with CO₂, forming carbonates and trapping carbon in the soil.

Without active volcanoes to reverse this process, the gas ceased to circulate. This led to the loss of the greenhouse effect, essential for maintaining heat. The result: Mars cooled drastically and permanently.

The Geological Failure of Mars

The significant factor lies in internal dynamics. Earth has active tectonic plates and a magma mantle that fuels frequent eruptions.

Mars, being smaller and colder, lost its geological activity early. Without carbon recycling, its wet periods were fleeting.

Models show that habitable phases on Mars lasted only millions of years. On Earth, the climate remained stable for billions of years.

This stability allowed life to emerge and evolve. Mars, lacking this natural control, lost the chance to be a habitable world early on.

Why Did Mars Lose Its Habitability While Earth Did Not?

Mars and Earth Began with Similar Conditions, But Took Opposite Paths. One Planet Sustained Life for Billions of Years. The Other Became a Frozen Desert. The Reason? The Way Each Handled Atmospheric Carbon.

The Secret of Earth: Balance of CO₂

Mars: The Collapse of the Greenhouse Effect

The Geological Failure of Mars

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The Geological Failure of Mars

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