Huge 'bathtub ring' may show contours of ancient ocean on Mars

A massive, newly identified geological feature strengthens the case for a vast, ancient ocean that once covered Mars's northern plains. | Contesto: cronaca

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• Huge 'bathtub ring' may show contours of ancient ocean on Mars

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Scientists analyzing orbital data have identified a colossal geological formation on Mars, described as a "bathtub ring" hundreds of meters high, which may delineate the shoreline of a vast, ancient ocean that existed billions of years ago. The finding, published this week, provides some of the most compelling topographical evidence yet for the long-debated hypothesis that the Red Planet's northern lowlands were once filled with water. The research builds upon decades of intermittent evidence and scientific debate. Since the 1980s, various missions have returned data suggesting the presence of past aqueous environments, from dried-up river channels and deltaic deposits to mineral signatures formed in water. Specific studies had previously pointed to subtle, continent-scale topographic rises in the northern plains that could be interpreted as ancient beaches, but the evidence remained controversial, with some scientists attributing the features to tectonic activity or other geological processes. This new analysis synthesizes vast datasets from spacecraft like NASA's Mars Global Surveyor and Mars Reconnaissance Orbiter. It focuses on a continuous, steep escarpment that rings the northern plains, tracing a consistent elevation for thousands of kilometers. The scale and uniformity of this feature, the researchers argue, are difficult to explain without the persistent, wave-driven erosion of a standing body of water—a paleo-ocean. The "ring" is not a single cliff but a complex zone where the terrain shifts dramatically, consistent with a ancient coastline that would have been shaped over eons. The implications of a confirmed Martian ocean are profound for understanding the planet's climatic history and potential for life. A body of water of that magnitude—potentially holding more water than Earth's Arctic Ocean—suggests Mars once had a much thicker atmosphere and a climate warm enough to support a sustained hydrological cycle. This habitable environment, likely existing over three billion years ago, would have provided a niche, potentially for hundreds of millions of years, where microbial life could have emerged and thrived. The ancient seabed is now a primary...

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Categoria: cronaca