{"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/mercury-shrinkage-may-be-30-greater-than-previously-thought","slug":"mercury-shrinkage-may-be-30-greater-than-previously-thought","url":"https://mediabias.news/tech/mercury-shrinkage-may-be-30-greater-than-previously-thought","title":"Mercury Shrinkage May Be 30% Greater Than Previously Thought","subtitle":"New study attributes planet's contraction to cooling iron core, leading to surface tightening.","excerpt":"Scientists estimate Mercury's diameter may have shrunk by up to 14 miles (23 kilometers), a figure 30% greater than earlier projections. The planet's hot iron core cooling and contracting is believed to be the cause, tightening its surface.","category":"Science & Tech","area":null,"publishedAt":"2026-09-10T19:05:12.801Z","sourceReportedAt":"2026-09-10T18:09:56.000Z","updatedAt":"2026-09-10T19:05:12.801Z","readTime":"2 min read","scores":{"trust":42,"critic":57,"hype":41,"notes":{"trust":"Central claim attributed to named researchers and journal; one full report and 39 digests provide corroboration.","critic":"The full report quotes a lead author and mentions a specific instrument, but lacks comment from affected parties or discussion of future implications.","hype":"Headlines use phrases like 'shrinking faster than expected' and 'drastically underestimated' which are mildly sensational."}},"tags":["#MercuryShrinkage","#PlanetaryScience","#SpaceExploration","#GermanAerospaceCenter","#GeophysicalResearchLetters"],"entities":["Mercury","German Aerospace Center","BepiColombo","Gaku Nishiyama"],"body":[{"type":"key_takeaways","items":["Mercury's diameter may have decreased by up to 14 miles (23 kilometers), a shrinkage potentially 30% larger than previously estimated.","Researchers attribute the planet's contraction to its internal iron core cooling and shrinking, which tightens the surface.","A new study published in Geophysical Research Letters used maps of Mercury's faults and surface roughness to reassess its shrinkage.","The European and Japanese BepiColombo spacecraft is scheduled to enter orbit around Mercury in November."]},{"type":"paragraph","text":"Scientists estimate that Mercury may be shrinking 30% more than previously believed, potentially losing up to 14 miles (23 kilometers) in diameter. This contraction is attributed to the planet's hot iron core cooling and contracting over billions of years, causing its surface to tighten."},{"type":"paragraph","text":"The findings, published in the journal Geophysical Research Letters by researchers from the German Aerospace Center's Institute of Space Research, were derived by comparing maps of Mercury's faults and geologic signs of contraction with newer maps detailing surface roughness. The study suggests that rougher areas, possibly obscured by impact debris, may have hidden the full extent of the shrinkage."},{"type":"heading","text":"Coverage comparison"},{"type":"paragraph","text":"The European and Japanese BepiColombo spacecraft, designed for a fuller survey of Mercury, is expected to enter orbit around the planet in November."},{"type":"heading","text":"What the coverage left out"},{"type":"paragraph","text":"None of the left, centre, or right-rated reports below mention the specific names of the researchers from the German Aerospace Center's Institute of Space Research, other than Gaku Nishiyama, who is identified as the study's lead author in the full report from CTV News."}],"basedOn":[{"sourceName":"Time Magazine","url":"https://time.com/article/2026/09/10/mercury-shrinking-study","headline":"The Planet Mercury Has Been Shrinking—More Than Scientists Expected","angle":"","publishedAt":"2026-09-10T18:53:04.225Z"},{"sourceName":"Stirile Pro TV","url":"https://stirileprotv.ro/o-planeta-din-sistemul-nostru-solar-se-micsoreaza-de-miliarde-de-ani-ridurile-de-pe-suprafata-ei-au-dezvaluit-un-secret.html","headline":"A Planet in Our Solar System Has Been Shrinking for Billions of Years. \"The Raids on Its Surface Have Revealed a Secret","angle":"","publishedAt":"2026-09-10T18:42:17.000Z"},{"sourceName":"SciencePost","url":"https://sciencepost.fr/les-falaises-qui-balafrent-mercure-ne-viennent-d-aucun-impact-de-meteorite-la-planete-se-ratatine-sur-elle-meme-et-a-deja-perdu-23-kilometres","headline":"The Cliffs that Sweep Mercury Do Not Come From Any Meteorite Impact: the Planet Ratatines on Itself and Has Already Lost 23 Kilometers","angle":"","publishedAt":"2026-09-10T18:09:56.000Z"},{"sourceName":"Unknown","url":"https://ethnos.gr/World/article/420162/tomysthriotoyermhgiatiomikroterosplanhthstoyhliakoysysthmatossyrriknonetai","headline":"The Mystery of Mercury: Why the Solar System's Smallest Planet Is Shrinking","angle":"","publishedAt":"2026-09-10T17:46:00.000Z"},{"sourceName":"Unknown","url":"https://epiloges.tv/epistimi-diastima-o-ermis-mporei-na-exei-syrriknothei-eos-30-perissotero-apo-oso-pisteyame","headline":"Science-Space: Mercury May Have Shrunk up to 30% More than We Thought","angle":"","publishedAt":"2026-09-10T17:44:53.000Z"},{"sourceName":"IFLScience","url":"https://iflscience.com/mercury-is-shrinking-faster-than-thought-new-analysis-of-its-many-wrinkles-reveals-84619","headline":"Mercury Is Shrinking Faster Than Thought, New Analysis Of Its Many Wrinkles Reveals","angle":"","publishedAt":"2026-09-10T16:31:55.000Z"},{"sourceName":"The Record","url":"https://troyrecord.com/2026/09/10/mercury-shrinkage","headline":"Little Mercury may be shrinking faster than scientists expected","angle":"","publishedAt":"2026-09-10T16:30:30.000Z"},{"sourceName":"Purdue Exponent","url":"https://purdueexponent.org/news/national/mercury-shrinking-more-than-scientists-previously-thought/article_e92a3c83-9898-5a47-bab2-ea6c9ca800e7.html","headline":"Mercury shrinking more than scientists previously thought","angle":"","publishedAt":"2026-09-10T16:05:43.000Z"},{"sourceName":"Sunnyside Sun","url":"https://sunnysidesun.com/news/national/mercury-shrinking-more-than-scientists-previously-thought/article_93e346b8-d665-5db6-b3fa-305b84667d6c.html","headline":"Mercury shrinking more than scientists previously thought","angle":"","publishedAt":"2026-09-10T16:05:43.000Z"},{"sourceName":"Daily Post-Athenian","url":"https://dailypostathenian.com/news/national/article_cab0c3da-f71e-5aa1-8022-55d57ca7e774.html","headline":"Mercury shrinking more than scientists previously thought","angle":"","publishedAt":"2026-09-10T16:05:43.000Z"},{"sourceName":"Maquoketa Sentinel-Press","url":"https://maqnews.com/news/national/mercury-shrinking-more-than-scientists-previously-thought/article_5dd0b92b-bb87-5744-98ac-1fc09bb2b93b.html","headline":"Mercury shrinking more than scientists previously thought","angle":"","publishedAt":"2026-09-10T16:05:43.000Z"},{"sourceName":"Independent Español","url":"https://independentespanol.com/noticias/ciencia/mercurio-podria-estar-encogiendose-mas-rapido-de-lo-que-los-cientificos-esperaban-b3048126.html","headline":"Mercury Could Be Shrinking Faster than Scientists Expected.","angle":"","publishedAt":"2026-09-10T16:05:35.000Z"},{"sourceName":"Space","url":"https://space.com/astronomy/mercury/mercury-is-shrinking-faster-than-we-thought-whats-going-on-inside-of-it","headline":"Mercury is shrinking faster than we thought. What's going on inside of it?","angle":"","publishedAt":"2026-09-10T15:00:00.000Z"},{"sourceName":"Washington Top News","url":"https://wtop.com/national/2026/09/little-mercury-may-be-shrinking-faster-than-scientists-expected","headline":"Little Mercury may be shrinking faster than scientists expected – WTOP News","angle":"","publishedAt":"2026-09-10T14:49:00.000Z"},{"sourceName":"Mediafax","url":"https://mediafax.ro/stirile-zilei/planeta-mercur-s-ar-putea-micsora-mai-repede-decat-se-asteptau-oamenii-de-stiinta-care-este-motivul-23805102","headline":"The Mercury Planet Could Shrink Faster than Scientists Expected.","angle":"","publishedAt":"2026-09-10T14:29:19.955Z"},{"sourceName":"CTV News","url":"https://ctvnews.ca/sci-tech/article/this-planet-may-be-shrinking-faster-than-scientists-expected","headline":"This planet may be shrinking faster than scientists expected","angle":"","publishedAt":"2026-09-10T14:27:19.501Z"},{"sourceName":"My Mother 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