{"publisher":{"name":"MediaBias News","url":"https://mediabias.news","methodology":"https://mediabias.news/methodology","editorialPrinciples":"https://mediabias.news/editorial-principles","corrections":"https://mediabias.news/corrections"},"scoreGuide":{"trust":"How well corroborated and evidenced the source reporting is. 0-100, higher is better.","critic":"Craft quality of the source journalism: context, balance, fact vs comment. 0-100, higher is better.","hype":"How far the source presentation runs ahead of substance. 0-100, LOWER IS BETTER.","scope":"Scores assess the original reporting this article was written from, not the truth of the underlying event and not the quality of this write-up."},"assessmentGuide":{"type":"coverage-and-source-reporting-analysis","factCheck":{"status":"not-performed","note":"Media Bias News compares coverage and scores the source reporting. It does not currently publish a ClaimReview verdict on whether the underlying event or claim is true."},"sourceFactuality":{"note":"Factuality values describe published ratings of the outlets that covered the story. They are not a factuality verdict on this story or its claims."}},"story":{"id":"https://mediabias.news/tech/mars-cloud-forms-via-rare-process-never-before-seen-in-planetary-atmosphere","slug":"mars-cloud-forms-via-rare-process-never-before-seen-in-planetary-atmosphere","url":"https://mediabias.news/tech/mars-cloud-forms-via-rare-process-never-before-seen-in-planetary-atmosphere","title":"Mars cloud forms via rare process never before seen in planetary atmosphere","subtitle":"Scientists discover the Arsia Mons Elongated Cloud forms without dust particles through homogeneous nucleation.","excerpt":"A giant cloud near Mars' Arsia Mons volcano forms daily through a process called homogeneous nucleation, where water vapor turns directly into ice. This method has never been observed in a planetary atmosphere before, challenging previous assumptions about cloud formation.","category":"Science & Tech","area":null,"publishedAt":"2026-10-08T18:05:30.763Z","sourceReportedAt":"2026-10-08T16:54:26.000Z","updatedAt":"2026-10-08T18:05:30.763Z","readTime":"3 min read","scores":{"trust":42,"critic":61,"hype":41,"notes":{"trust":"Two full reports and 34 digests corroborate the central claims about the cloud's formation.","critic":"The reporting clearly separates the scientific findings from speculation and provides context for the discovery.","hype":"Headlines use words like 'impossible' and 'strangest' but the body of the reporting is measured."}},"tags":["#Mars","#Space","#PlanetaryScience","#CloudFormation","#ArsiaMons"],"entities":["Arsia Mons","Arsia Mons Elongated Cloud (AMEC)","Jorge Hernández Bernal","European Space Agency (ESA)","Mars Express"],"body":[{"type":"key_takeaways","items":["A giant cloud, the Arsia Mons Elongated Cloud (AMEC), forms daily near the Arsia Mons volcano on Mars during spring and summer.","Scientists have discovered the AMEC forms through homogeneous nucleation, a process where water vapor turns directly into ice particles without needing dust.","This is the first time homogeneous nucleation has been observed in a planetary atmosphere.","The cloud can stretch up to 1,800 km (1,120 miles) long."]},{"type":"paragraph","text":"A massive cloud, known as the Arsia Mons Elongated Cloud (AMEC), forms daily near the Arsia Mons volcano on Mars during the planet's spring and summer seasons. This orographic cloud is created by wind flowing past the volcano's topography and can extend up to 1,800 km (1,120 miles) in length."},{"type":"paragraph","text":"New research indicates that the AMEC forms through a process called homogeneous nucleation. This involves water vapor transforming directly into ice particles without the need for dust or other impurities to act as a nucleus. This phenomenon has not been previously observed in any planetary atmosphere."},{"type":"heading","text":"Disagreement on the novelty of the process"},{"type":"paragraph","text":"While the new study highlights the observation of homogeneous nucleation in a planetary atmosphere as unprecedented, Eldiario.es reports that Jorge Hernández Bernal, lead author of the study, stated that homogeneous nucleation of liquid to ice without passing through the liquid state had never been seen before. Phys.org also notes that scientists had suggested this process might take place in the upper atmospheres of Earth and Venus, but it had not been spotted."},{"type":"heading","text":"What the coverage left out"},{"type":"paragraph","text":"None of the left-rated digests mention the specific dimensions of the cloud beyond its length, nor do they detail the specific temperature drop or humidity spike described in the full reports. None of the centre-rated digests mention the specific temperature drop or humidity spike described in the full reports."}],"basedOn":[{"sourceName":"IFLScience","url":"https://iflscience.com/weird-physics-causes-this-lonely-martian-cloud-to-reappear-and-grow-longer-than-california-every-day-84893","headline":"Weird Physics Causes This Lonely Martian Cloud To Reappear And Grow Longer Than California Every Day","angle":"","publishedAt":"2026-10-09T16:32:53.000Z"},{"sourceName":"Futura","url":"https://futura-sciences.com/sciences/actualites/mars-mars-nuage-geant-apparait-chaque-matin-son-secret-defie-ce-on-croyait-possible-138371","headline":"On Mars, a Giant Cloud Appears Every Morning: Its Secret defies...","angle":"","publishedAt":"2026-10-09T09:19:44.000Z"},{"sourceName":"CNN Brasil","url":"https://cnnbrasil.com.br/ciencia/nuvem-gigante-de-1800-km-aparece-e-desaparece-diariamente-na-superficie-de-marte","headline":"Giant 1800 Km Cloud Appears and Disappears Daily on the Surface of Mars","angle":"","publishedAt":"2026-10-09T08:25:10.000Z"},{"sourceName":"Karar Gazetesi","url":"https://karar.com/teknoloji-haberleri/marsta-daha-once-gorulmemis-bir-olusum-dev-bulutun-sirri-cozuldu-2077233","headline":"An Unprecedented Formation on Mars: The Mystery of the Giant Cloud Has Been Solved.","angle":"","publishedAt":"2026-10-09T06:51:00.000Z"},{"sourceName":"TUOI TRE ONLINE","url":"https://tuoitre.vn/bi-an-dam-may-dai-1800km-tren-sao-hoa-100261009111919026.htm","headline":"The Mystery of the 1,800km-Long Cloud on Mars.","angle":"","publishedAt":"2026-10-09T06:24:00.000Z"},{"sourceName":"Naftemporiki","url":"https://naftemporiki.gr/techscience/2172738/kolossiaio-synnefo-1800-chlm-ston-ari-einai-proion-exotikis-fysikis","headline":"Colossal 1,800 Km Cloud on Mars Is the Product of \"Exotic Physics\"","angle":"","publishedAt":"2026-10-09T05:52:37.000Z"},{"sourceName":"wissenschaft.de","url":"https://wissenschaft.de/artikel/spektakulaere-marswolke-beruht-auf-exotischer-physik","headline":"Spectacular Mars Cloud Based on Exotic Physics","angle":"","publishedAt":"2026-10-09T04:31:16.000Z"},{"sourceName":"Discover Magazine","url":"https://discovermagazine.com/mars-odd-1-100-mile-long-cloud-forms-in-mysterious-ways-a-new-model-may-reveal-how-49791","headline":"Mars' Odd 1,100 Mile Long Cloud Forms in Mysterious Ways — a New Model May Reveal How","angle":"","publishedAt":"2026-10-08T22:15:00.000Z"},{"sourceName":"abcgazetesi.com.tr","url":"https://abcgazetesi.com.tr/bilgi/marsin-gizemli-bulutuyla-ilgili-sasirtan-kesif-nedeni-cok-farkli-cikti-873387","headline":"Surprising Discovery Regarding Mars' Mysterious Cloud: The Reason Turns Out to Be Very Different!","angle":"","publishedAt":"2026-10-08T21:47:00.000Z"},{"sourceName":"BizToc","url":"https://biztoc.com/x/c9ea69cafe1ab7b7","headline":"Mars’ Giant Arsia Mons Cloud Is Stranger Than Scientists Thought","angle":"","publishedAt":"2026-10-08T21:01:31.000Z"},{"sourceName":"tippinsights","url":"https://tippinsights.com/mars-giant-arsia-mons-cloud-is-stranger-than-scientists-thought","headline":"Mars’ Giant Arsia Mons Cloud Is Stranger Than Scientists Thought","angle":"","publishedAt":"2026-10-08T21:01:31.000Z"},{"sourceName":"Gizmodo","url":"https://gizmodo.com/marss-weirdest-cloud-forms-in-a-way-scientists-thought-was-impossible-2000823646","headline":"Mars’s Weirdest Cloud Forms in a Way Scientists Thought Was Impossible","angle":"","publishedAt":"2026-10-08T20:30:16.000Z"},{"sourceName":"SciencePost","url":"https://sciencepost.fr/au-dessus-d-un-volcan-de-mars-haut-de-20-km-nait-chaque-matin-un-nuage-de-1-800-km-pres-de-deux-fois-le-royaume-uni-qu-aucun-modele-n-arrivait-a-reproduire","headline":"Above a 20 Km High Mars Volcano, a Cloud of 1,800 Km, Nearly Twice the United Kingdom, Was Born Each Morning, and No Model Could Reproduce It.","angle":"","publishedAt":"2026-10-08T17:33:41.000Z"},{"sourceName":"n-tv","url":"https://n-tv.de/wissen/Forscher-loesen-Raetsel-um-gigantische-Mars-Wolke-id31395967.html","headline":"1800 Kilometres Long: Researchers Solve Puzzles Around Giant Mars Cloud","angle":"","publishedAt":"2026-10-08T17:26:24.000Z"},{"sourceName":"Universal-Sci","url":"https://universal-sci.com/article/scientists-discover-something-unexpected-behind-marss-mysterious-1800-kilometre-cloud","headline":"Scientists Discover Something Unexpected Behind Mars’s Mysterious 1800 Kilometre 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