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Story summary
- NASA's Perseverance rover at Jezero Crater used ground-penetrating radar to detect river delta deposits buried up to 35 meters deep, dating to 3.7–4.2 billion years ago.
- The results show Mars had liquid water earlier than previously thought, expanding the planet's hydrological history.
- The evidence reveals older river channels and deltaic deposits predating the current delta.
- This timeline for water presence could improve assessments of past habitability and guide future exploration.
