Using ground-penetrating radar, NASA's Perseverance rover has detected underground remains of an ancient river delta on Mars in some of the oldest evidence yet obtained showing how water once flowed on the surface of Earth's planetary neighbor. Using ground-penetrating radar, NASA's Perseverance rover has detected underground remains of an ancient river delta on Mars in some of the oldest evidence yet obtained showing how water once flowed on the surface of Earth's planetary neighbor. Resea... [3693 chars]
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