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A year after NASA\u2019s Perseverance rover<\/a> drilled into a rock called Cheyava Falls, scientists have revealed that the sample it collected, known as Sapphire Canyon, contains what could be a chemical fingerprint of ancient microbial life.\u00a0<\/p>\n Published this week in the journal Nature<\/a>, the finding has been described by NASA as the closest humanity has come to evidence of life beyond Earth.<\/p>\n Ancient river valley on Mars may have preserved signs of life<\/p>\n Perseverance came across the Cheyava Falls outcrop in July 2024 while exploring the Bright Angel formation, a network of rocky deposits on the edges of Neretva Vallis. Billions of years ago, this broad river valley funnelled water into Jezero Crater, once home to a vast lake.<\/p>\n Sedimentary rocks in the area are rich in clay, silt and organic carbon, materials that on Earth are excellent preservers of microbial remains. These rocks also contain sulphur, oxidised iron and phosphorus\u2014potential fuel sources for primitive life.<\/p>\n Scientists had long suspected Jezero Crater to be one of the most promising sites for astrobiology, but the rover\u2019s<\/a> latest findings suggest the Red Planet may have been habitable for longer, and later, than many expected.<\/p>\n Perseverance rover finds strange spots in Martian mudstone<\/p>\n When Perseverance trained its suite of instruments on Cheyava Falls, particularly PIXL and SHERLOC, it detected colourful spots patterned across the rock surface. High-resolution images revealed what researchers called \u201cleopard spots\u201d: mineral reaction fronts rich in two iron-based minerals, vivianite and greigite.<\/p>\n On Earth, vivianite often appears in sediments around decaying organic matter, while greigite can be formed by certain microbes. Together, the minerals are potential traces of electron-transfer reactions\u2014the same kind microbes use to generate energy.<\/p>\n Yet as scientists stress, the minerals could also form through geological processes without biology. High heat, acidic conditions or purely chemical reactions could have created them, although there is no evidence of such extreme conditions in the Bright Angel rocks.<\/p>\n Why Perseverance\u2019s discovery could reshape the search for life on Mars<\/p>\n The Cheyava Falls mudstones are among the youngest sedimentary rocks Perseverance has studied. Until now, researchers assumed that only much older rocks would contain traces of life. The new data suggests Mars may have supported habitable conditions<\/a> more recently in its history than previously believed.<\/p>\n \u201cThis is a potential fingerprint of microbial life,\u201d said Joel Hurowitz, lead author of the Nature paper. \u201cBut just because the chemistry looks compelling doesn\u2019t mean it\u2019s proof of biology. That\u2019s why further study is essential.\u201d<\/p>\n Katie Stack Morgan, Perseverance\u2019s project scientist, cautioned: \u201cAstrobiological claims require extraordinary evidence. This is a crucial step forward, but we cannot yet rule out non-biological explanations.\u201d<\/p>\n Mars Sample Return mission holds the answers<\/p>\n Perseverance has already collected 27 rock cores since landing in Jezero Crater in 2021, sealing them in slim metal tubes for possible return to Earth.<\/p>\n NASA designed the rover\u2019s instruments to identify potential biosignatures but always planned for Earth-based laboratories to conduct the decisive tests.<\/p>\n \u201cWe\u2019ve basically thrown the entire rover payload at this rock,\u201d said Stack Morgan. \u201cWe\u2019re now at the limits of what Perseverance can do on the surface. The next chapter depends on bringing these samples home.\u201d<\/p>\n![\"Leopard](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2025\/09\/Leopard-spots-in-cheyava-Falls-on-mars-1024x745.jpeg\")
Photo: NASA<\/p>\n