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    "story_id": "mp-2026-10-30-014",
    "source_story_id": "tmp-story-ghz8-early-galaxy-burst",
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    "headline": "Two Clumps Share a Galaxy at Redshift 10.23",
    "slug": "two-clumps-share-a-galaxy-at-redshift-10-23",
    "dek": "JWST spectroscopy and imaging resolve GHZ8 into components about 600 parsecs apart, with evidence for a very young burst and possible merger activity.",
    "summary": "JWST spectroscopy and imaging resolve GHZ8 into components about 600 parsecs apart, with evidence for a very young burst and possible merger activity.",
    "body_text": "JWST/MIRI spectroscopy of the UV-bright galaxy GHZ8 at redshift 10.23 detected the hydrogen-beta plus oxygen complex at about five sigma and hydrogen-alpha at about four sigma. NIRCam imaging resolves a bright main component and a compact southeastern clump separated by 0.16 arcseconds, roughly 600 parsecs. Their blue ultraviolet slopes indicate young stellar populations; modeling of the smaller clump favors an extremely young, interstellar-medium-poor population with a high ionizing-photon escape fraction. The main component is consistent with a recent short burst or less than 50 million years of continuous star formation. A merger-induced starburst remains a possibility, not a conclusion, pending deeper imaging or resolved kinematics.",
    "why_it_matters": "JWST spectroscopy and imaging resolve GHZ8 into components about 600 parsecs apart, with evidence for a very young burst and possible merger activity.",
    "limitations": [
      "A merger-induced starburst remains a possibility, not a conclusion, pending deeper imaging or resolved kinematics."
    ],
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    "first_published_at": "2026-10-30T09:00:00.000-04:00",
    "modified_at": "2026-10-30T09:00:00.000-04:00",
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        "text": "JWST spectroscopy and imaging resolve GHZ8 into components about 600 parsecs apart, with evidence for a very young burst and possible merger activity.",
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        "qualification": "A merger-induced starburst remains a possibility, not a conclusion, pending deeper imaging or resolved kinematics."
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    "tags": [
      "JWST",
      "early universe",
      "galaxies",
      "star formation"
    ],
    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-10-30-014",
      "title": "arXiv preprint 2610.40633, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2610.40633v1",
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      "published_at": "2026-10-28T20:00:00.000-04:00",
      "accessed_at": "2026-10-30T08:14:40.422-04:00",
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  "cite_this_report": {
    "title": "Two Clumps Share a Galaxy at Redshift 10.23",
    "publisher": "The Machine Press",
    "published_at": "2026-10-30T09:00:00.000-04:00",
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