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    "story_id": "mp-2026-07-19-002",
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    "headline": "The Dinosaur Killer Was an Oddball",
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    "dek": "Nickel isotopes in the global impact layer point to an exceptionally rare CO carbonaceous chondrite, not a typical meteorite.",
    "summary": "Nickel isotopes in the global impact layer point to an exceptionally rare CO carbonaceous chondrite, not a typical meteorite.",
    "body_text": "Researchers from British Columbia, Paris, Brussels, and Vienna analyzed nickel isotope traces preserved in the thin clay layer left by the Chicxulub impact. The signature points to a carbonaceous chondrite of the Ornans class, a very small subset of the roughly five percent of sampled meteorites classed as carbonaceous. Because CO chondrites contain relatively little sulfur, the team argues that fine debris lofted by the impact was probably more important to the extinction aftermath than sulfur carried inside the projectile. The isotope result narrows the impactor class; it does not identify its exact original orbit.",
    "why_it_matters": "Nickel isotopes in the global impact layer point to an exceptionally rare CO carbonaceous chondrite, not a typical meteorite.",
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      "The isotope result narrows the impactor class; it does not identify its exact original orbit."
    ],
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        "qualification": "The isotope result narrows the impactor class; it does not identify its exact original orbit."
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    "tags": [
      "Chicxulub",
      "meteorites",
      "nickel isotopes"
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    {
      "source_id": "source-2026-07-19-002",
      "title": "University of British Columbia via ScienceDaily: Chicxulub impactor class",
      "publisher": "University of British Columbia via ScienceDaily",
      "url": "https://www.sciencedaily.com/releases/2026/07/260718010142.htm",
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      "accessed_at": "2026-07-19T08:27:22.202-04:00",
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  "cite_this_report": {
    "title": "The Dinosaur Killer Was an Oddball",
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