Mars was always too small to hold onto its oceans, rivers and lakes

Mars was doomed to desiccation by its small size, a new study suggests.

Thanks to observations by robotic explorers such as NASA’s Curiosity and Perseverance rovers, scientists know that in the ancient past, liquid water coursed across the Martian surface: The Red Planet once hosted lakes, rivers and streams, and possibly even a huge ocean that covered much of its northern hemisphere.

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