NASA’s Perseverance rover has uncovered hidden subsurface evidence of an ancient river delta on Mars, offering new insights into the planet’s water-rich past.

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• NASA’s Perseverance rover has detected underground geological formations in Jezero Crater, confirming the presence of an ancient river delta formed billions of years ago.
• NASA’s Perseverance rover used ground-penetrating radar to detect subsurface structures nearly 35 meters deep, revealing signs of an ancient river delta formation on Mars.
• The discovery was made after the rover traveled around 6.1 kilometers inside Jezero Crater, a region believed to have hosted a large ancient lake basin.
• Scientists estimate the buried delta to be approximately 3.7 to 4.2 billion years old, making it one of the earliest geological formations on Mars.
• The findings show layered sediments and erosion patterns, confirming that water once flowed and deposited materials in a delta-like environment on the planet.
• The RIMFAX radar instrument enabled scientists to create a three-dimensional view of Mars’ subsurface by analyzing reflected radar signals over 250 Martian days.
• Researchers believe such environments could have preserved biosignatures, increasing the possibility that microbial life may have once existed on ancient Mars.
• The newly discovered delta appears older than the nearby Western Delta, suggesting that water activity on Mars began earlier than previously understood.
• Overall, the findings strengthen evidence that Mars once had a warmer climate and thicker atmosphere capable of sustaining liquid water on its surface.