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Why the lack of water on Mars is so mysterious

🇬🇧 New Scientist SpaceScience & DiscoveryMon, 30 Mar 2026 07:00:04 GMT· edited
Why the lack of water on Mars is so mysterious

New research highlights a puzzling gap in Mars's water history, raising questions about the planet's past and evolution.

A recent study has revealed a significant discrepancy in the expected amount of water on Mars, deepening the mystery surrounding the planet’s hydrological history. Scientists have long believed that Mars once had substantial surface water, but new findings suggest that much less water remains than previously thought.

The research involved a detailed analysis of the water that should have been present on Mars over its history, taking into account factors such as atmospheric loss and geological processes. According to the study, the current water content on Mars does not match the estimates derived from ancient surface features, such as dried riverbeds and lake basins.

This mismatch has left scientists puzzled about what happened to the missing water. One possibility is that a significant portion of it may have been lost to space over billions of years, while another theory suggests that some water may be trapped deep underground in the planet’s crust.

Understanding Mars’s water history is crucial for determining whether the planet could have once supported life. The findings underscore the complexity of the Red Planet’s past and highlight the need for further exploration and research to uncover the full story of its evolution.

Original headline: Why the lack of water on Mars is so mysterious
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