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The find doesn\u2019t mean Ryugu carried life<\/a>, or even full genetic molecules. But it does strengthen a simple, powerful idea: the Solar System seems to manufacture life\u2019s key ingredients widely, and asteroids could have delivered some of them to early Earth.<\/p>\n The results come from material brought back by Japan\u2019s Hayabusa2 <\/a>mission.<\/p>\n Avoiding Earth\u2019s contamination problem<\/p>\n Nucleobases have been found before in carbonaceous meteorites, and more recently in material from the asteroid Bennu<\/a>.\u00a0<\/p>\n But meteorites sit on Earth, absorb moisture, and pick up contamination, which always leaves room for doubt.\u00a0<\/p>\n Ryugu is different: Hayabusa2 collected its samples directly in space and sealed them for the trip home, giving researchers a rare look at organic chemistry that hasn\u2019t been marinating in Earth\u2019s atmosphere<\/a>.<\/p>\n Hayabusa2 visited Ryugu in 2018, used impactors to stir up material, and returned the samples to Earth in 2020.\u00a0<\/p>\n The new paper focuses on two Ryugu \u201caggregate\u201d samples, A0480 and C0370, and also analyzes the Orgueil meteorite as a comparison because its mineral makeup resembles Ryugu\u2019s.<\/p>\n The molecular elements of life<\/p>\n The headline is simple: adenine, guanine, cytosine, thymine, and uracil show up in Ryugu. Those are the standard nucleobases used by life on Earth.\u00a0<\/p>\n In DNA<\/a>, the set is A, G, C, T; in RNA, thymine is replaced by uracil. The team reports robust detection of all five in the Ryugu samples using high-precision methods and cross-checks.<\/p>\n To get there, the researchers first extracted soluble compounds from the samples using water, then did a second extraction with 6 M hydrochloric acid.\u00a0<\/p>\n They then used high-performance liquid chromatography paired with high-resolution mass spectrometry to identify nucleobase peaks by matching them to authentic standards.<\/p>\n Additional molecules found<\/p>\n The researchers also found non-canonical compounds that still matter biologically. Two purines, hypoxanthine and xanthine, appeared in the samples.\u00a0<\/p>\n These aren\u2019t part of DNA or RNA, but they are key intermediates in how living systems build nucleotides. On the pyrimidine side, the team also identified 6-methyluracil, a structural isomer of thymine that is rarely used in biology.<\/p>\n Because sample mass is precious, only two compounds \u2013 guanine and cytosine in one extract \u2013 were abundant enough for tandem mass spectrometry confirmation.\u00a0<\/p>\n However, the team used an additional method, capillary electrophoresis coupled to high-resolution MS, to further corroborate the identifications across the dataset.<\/p>\n More than just life ingredients <\/p>\n One of the most interesting parts of the paper is that Ryugu\u2019s nucleobases don\u2019t show the same balance seen in other famous extraterrestrial materials.\u00a0<\/p>\n The experts report that Ryugu contains nearly equal amounts of purines and pyrimidines, while the Murchison meteorite is richer in purines and Bennu and Orgueil lean toward pyrimidines.<\/p>\n The researchers also describe a chemical clue that might explain the differences. In Ryugu, Bennu, and Orgueil \u2013 materials with broadly similar mineralogy and elemental composition \u2013 the purine-to-pyrimidine ratio appears to negatively correlate with ammonia<\/a>.\u00a0<\/p>\n The team interprets that pattern as evidence that nucleobases across these bodies may form through related pathways, but that the final mix depends on the specific chemical environment inside each parent body.<\/p>\n This is the kind of result that excites planetary chemists because it turns nucleobases into more than \u201clife ingredients.\u201d\u00a0<\/p>\n If their abundances track parent-body conditions, they could become chemical breadcrumbs \u2013 helping scientists connect meteorites to their origins and reconstruct the history of water-rock chemistry inside ancient asteroids.<\/p>\n The team didn\u2019t just look for organic molecules; they also used isotopes to help argue that what they found is truly indigenous.\u00a0<\/p>\n The researchers estimate that about 30\u201340% of Ryugu\u2019s total carbon and nitrogen is contained in water- and acid-soluble components. <\/p>\n These fractions show relatively heavy isotope signatures \u2013 \u03b4\u00b9\u00b3C of roughly +25.5\u2030 to +33.9\u2030 and \u03b4\u00b9\u2075N of roughly +45.1\u2030 to +59.8\u2030 \u2013 well outside typical terrestrial organic ranges.<\/p>\n That doesn\u2019t automatically prove every molecule\u2019s origin on its own, but it strengthens the case that the organic inventory is genuinely extraterrestrial and shaped by chemistry that played out long before Earth ever touched the material.<\/p>\n Implications for the origin of life<\/p>\n Yasuhiro Oba of Hokkaido University<\/a> frames the finding as evidence that these nucleobases aren\u2019t rare oddities \u2013 they\u2019re likely widespread in the Solar System.\u00a0<\/p>\n In the same spirit, he also suggests that if asteroids can assemble the building blocks, it\u2019s plausible that even larger, more complex organic molecules could form in asteroid environments as well, though that remains an open question.<\/p>\n This finding doesn\u2019t claim Ryugu carried DNA or RNA. But it does reinforce the broader hypothesis that carbonaceous asteroids helped stock early Earth\u2019s prebiotic \u201ctoolbox.\u201d\u00a0<\/p>\n If impacts and dust delivery brought nucleobases (along with amino acids, sugars, and other organics) to the young planet over long periods, that steady supply could have made it easier for chemistry on Earth to take the next steps toward biology.<\/p>\n The bigger takeaway is less about one asteroid and more about a pattern that keeps repeating: when we look closely at primitive, carbon-rich space rocks, we keep finding the same types of molecular parts.\u00a0<\/p>\n Ryugu now joins a growing list of worlds \u2013 small, cold, lifeless ones \u2013 that nevertheless seem surprisingly capable of cooking up the ingredients life needs.<\/p>\n The research is published in the journal Nature Astronomy<\/a>.\u00a0<\/p>\n Image Credit: European Space Agency <\/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<\/a>.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A speck of black asteroid dust is making life\u2019s origins look less exclusive to Earth. Scientists analyzing pristine…\n","protected":false},"author":2,"featured_media":358992,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[111,139,69,147],"class_list":{"0":"post-358991","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-science","8":"tag-new-zealand","9":"tag-newzealand","10":"tag-nz","11":"tag-science"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/358991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=358991"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/358991\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/358992"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=358991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=358991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=358991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}