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Story summary
- NASA's Perseverance rover has found evidence of an ancient river delta in Jezero Crater, indicating water flowed on Mars longer than previously thought.
- Using ground-penetrating radar, the rover mapped features up to 115 feet underground and revealed layered sediments typical of delta environments.
- The delta is 3.7 to 4.2 billion years old, predates the Western Delta, and the study was published in Science Advances.
