A Mysterious Rock in an Ancient Martian Riverbed NASA’s Perseverance rover, which landed in Jezero Crater in 2021, has been on the hunt for signs of past life. In an ancient river channel called Neretva Vallis – once a conduit for water into Jezero’s lake – the rover spotted something unusual last year washingtonpost.com theguardian.com. A flat, fine-grained…
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