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\u201cThis finding by Perseverance is the closest we have ever come to discovering life on Mars. The identification of a potential biosignature on the Red Planet is a groundbreaking discovery, and one that will advance our understanding of Mars,\u201d said former NASA Administrator Sean Duffy.<\/p>\n
\u201cNASA\u2019s commitment to conducting Gold Standard Science will continue as we pursue our goal of putting American boots on Mars\u2019 rocky soil.\u201d<\/p>\n
The core was taken from a rock named \u201cChevaya Falls<\/a>\u201d in Neretva Vallis, an ancient river channel about a quarter mile wide that once fed Jezero Crater\u2019s lake. <\/p>\n After drilling, Perseverance<\/a> sealed the sample for possible return to Earth, where laboratory instruments can perform tests far beyond the rover\u2019s onboard capabilities.<\/p>\n Inside the Martian mudstone<\/p>\n Lead author Joel A. Hurowitz of Stony Brook University<\/a> (SBU) reports a fine-grained mudstone with circular reaction fronts informally called leopard spots, plus small nodules embedded in layered sediments.<\/p>\n Perseverance\u2019s SHERLOC<\/a> and PIXL<\/a> instruments mapped organic carbon with phosphate, iron, and sulfur arranged in distinct, repeating patterns.<\/p>\n Two minerals stand out: vivianite and greigite. Vivianite is an iron phosphate, while greigite is an iron sulfide associated with iron and sulfur cycling in oxygen-poor settings.<\/p>\n These features show up in rocks that settled from water<\/a>, not in lavas. The site on Mars lies along Bright Angel, a set of outcrops that preserve layers and veins consistent with slow changes after the mud was laid down.<\/p>\n Textures and chemistry point to low temperature reactions that reorganized elements already present in the mud. <\/p>\n That detail matters because low temperatures fit environments that life can handle, while very hot conditions tend to erase delicate signals.<\/p>\n On Earth, vivianite often forms where microbes reduce iron in water-rich sediments and trap phosphorus in blue-green nodules. <\/p>\n Laboratory and field work document biologically mediated vivianite through extracellular electron transfer.<\/p>\n Greigite<\/a> frequently appears where sulfate reducing bacteria drive chemistry in anoxic muds. In controlled experiments, greigite was detected only in live biotic setups after months of incubation.<\/p>\n The Martian rock shows rims rich in vivianite surrounding small cores enriched in greigite. That bullseye pattern matches a sequence of electron transfer reactions seen in some Earth sediments.<\/p>\n None of this proves metabolism happened in Bright Angel mud, but it shows the chemistry is right for it. That is a subtle point, and it is the reason scientists keep the language cautious.<\/p>\n Evidence of life on Mars<\/p>\n A potential biosignature is a feature that might have a biological origin but still needs more data to rule out nonbiological sources. <\/p>\n NASA points mission teams and the public to the Confidence of Life Detection, or CoLD scale<\/a>, which encourages staged claims and independent checks.<\/p>\n The CoLD mindset is simple in practice. First detect a signal, then exclude contamination, then tackle alternatives, and only then talk about life on Mars with high confidence.<\/p>\n The Bright Angel work sits early on that ladder. It clears several necessary steps but leaves demanding tests for the lab.<\/p>\n Organic compounds can also arrive by meteorites<\/a> or form without biology. The authors note those routes and describe how future analyses could tell paths apart.<\/p>\n \u201cIt\u2019s not life itself,\u201d explained Nicky Fox, associate administrator for NASA\u2019s Science Mission Directorate, stressing that this is a potential biosignature, not proof of life. The lead author echoed that caution.\u00a0<\/p>\n \u201cWe cannot claim this is more than a potential biosignature,\u201d said Hurowitz. Other officials also underscored the stakes and the limits.\u00a0<\/p>\n Caution is not hedging for its own sake. It is how science avoids false alarms when the question is this important.<\/p>\n Implications for habitability<\/p>\n If the vivianite and greigite formed through microbe-like metabolisms, then Bright Angel<\/a> captures a period when surface waters supported the same chemical strategies some cells use for energy today. <\/p>\n That would extend Mars\u2019s habitability into a window when this part of Jezero was still wet.<\/p>\n If abiotic paths made the same pattern, the rock still records redox organization of iron, sulfur, and phosphorus in Martian mud. That is a window into how the planet cycles key elements without biology.<\/p>\n Either outcome matters for the bigger story. Mars did not just dry out, it changed its chemistry over time, and these samples let researchers track that change layer by layer.<\/p>\n The work also flags what to measure next. Isotopes, microtextures, and the exact structure of carbon<\/a> in the core can separate metabolic signatures from chemical lookalikes.<\/p>\n During a routine day on Mars in 2024, NASA\u2019s Curiosity rover ran over a rock and split it open. <\/p>\n This mishap turned out to be an accidental stroke of luck, exposing something no one had ever seen on the Red Planet: a striking cluster of bright yellow sulfur crystals<\/a>.<\/p>\n Curiosity quickly sent the images back to Earth, stunning scientists around the world, including Ashwin Vasavada, the mission\u2019s project scientist at NASA\u2019s Jet Propulsion Laboratory in Southern California.<\/p>\n \u201cFinding a field of stones made of pure sulfur is like discovering an oasis in the desert,\u201d Vasavada said. \u201cIt shouldn\u2019t be there, which means we now have to explain it. Moments like this \u2013 when Mars surprises us \u2013 are what make planetary exploration so thrilling.\u201d<\/p>\n Sulfur plays a key role in the search for life. On Earth, some microorganisms rely on sulfur compounds for energy, making the element a valuable clue in the ongoing quest to understand whether life could exist beyond our planet.<\/p>\n The authors lay out lab experiments and field analogs on Earth to test whether nonbiological reactions can reproduce these textures and mineral pairings. <\/p>\n They also point to analyses that require the sample in a clean Earth lab, including isotope ratios that biology tends to skew.<\/p>\n Sample return planning will shape how fast those tests happen. Meanwhile, the rover can keep mapping where these features cluster and how they relate to other rock units nearby.<\/p>\n PIXL and SHERLOC have shown enough sensitivity to guide that search. The pairing of elemental maps and Raman detections gives a consistent picture that can be applied to other outcrops.<\/p>\n As new targets are logged, the CoLD framework will help communicate progress without getting ahead of the data. That is how a potential biosignature becomes a result people can trust.<\/p>\n The study is published in the journal Nature<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A recent analysis of the Sapphire Canyon mudstone core, drilled by NASA\u2019s Perseverance rover in July 2024, adds…\n","protected":false},"author":2,"featured_media":224307,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[61,60,82,247],"class_list":{"0":"post-224306","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-space","8":"tag-ie","9":"tag-ireland","10":"tag-science","11":"tag-space"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/224306","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=224306"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/224306\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/224307"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=224306"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=224306"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=224306"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"An](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/mars-perseverance_Cheyava-Falls_Olivine_biosignature_NASA_1s.webp.webp\")
<\/a>An annotated version of the image of \u201cCheyava Falls\u201d indicates the markings akin to leopard spots, which have particularly captivated scientists, and the olivine in the rock. The image was captured by the WATSON instrument on NASA\u2019s Perseverance Mars rover. Credit: NASA. Click image to enlarge.Earth microbes leave similar traces<\/p>\n![\"Marked](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/mars-life_CoLD-benchmarks-chart_NASA_1s.webp.webp\")
<\/a>Marked by seven benchmarks, the Confidence of Life Detection, or CoLD, scale outlines a progression in confidence that a set of observations stands as evidence of life.
Credit: NASA. Click image to enlarge.Moving forward with caution<\/p>\n![\"The](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/mars-perseverance_beaver-falls_sapphire-canyon_holes_biosignature_Nature_1s.webp.webp\")
<\/a>The light-toned layered block contains the Cheyava Falls natural surface target, the Apollo Temple abrasion and the Sapphire Canyon core sample location. Credit: Nature. Click image to enlarge.Previous sulfur discovery on Mars<\/p>\n![\"Rock](\"https:\/\/www.newsbeep.com\/ie\/wp-content\/uploads\/2026\/01\/curiosity-rover_sulfur-crystals_inside-mars-rock_NASA_1s.webp.webp\")
<\/a>Rock in Gediz Vallis on Mars where Curiosity Rover found yellow sulfur crystal. Credit: NASA. Click image to enlarge.Next steps to confirm life on Mars<\/p>\n