{
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  "story": {
    "story_id": "mp-2026-10-28-002",
    "source_story_id": "tmp-feature-giant-odd-radio-circle",
    "edition_id": "mp-2026-10-28-morning-0110",
    "edition_url": "https://themachinepress.com/edition/2026-10-28",
    "position": 2,
    "story_type": "secondary",
    "section": "research",
    "editorial_classification": "editorial",
    "headline": "A Radio Circle Spans Two Million Light-Years",
    "slug": "a-radio-circle-spans-two-million-light-years",
    "dek": "ASKAP data reveal a faint 0.63-megaparsec ring around the brightest galaxy in Abell 3639, placing ORC J1928-5056 among the largest single odd radio circles known.",
    "summary": "ASKAP data reveal a faint 0.63-megaparsec ring around the brightest galaxy in Abell 3639, placing ORC J1928-5056 among the largest single odd radio circles known.",
    "body_text": "Odd radio circles are faint, roughly circular radio structures whose origins remain unsettled. Researchers report ORC J1928-5056 in 856-megahertz ASKAP continuum data as a mildly elliptical ring four arcminutes across. At the central galaxy's measured redshift of 0.1507, that angle corresponds to 0.63 megaparsecs, or roughly two million light-years. After subtracting the host's radio nucleus, the ring carries 73 millijanskys across about twelve square arcminutes and a rest-frame 1.4-gigahertz luminosity of 2 × 10^24 watts per hertz. The central object is a massive passive elliptical galaxy and brightest cluster galaxy with a radio jet. The observation establishes the size and radio properties of this candidate; it does not yet settle which proposed mechanism formed the circle.",
    "why_it_matters": "ASKAP data reveal a faint 0.63-megaparsec ring around the brightest galaxy in Abell 3639, placing ORC J1928-5056 among the largest single odd radio circles known.",
    "limitations": [
      "Odd radio circles are faint, roughly circular radio structures whose origins remain unsettled.",
      "The observation establishes the size and radio properties of this candidate; it does not yet settle which proposed mechanism formed the circle."
    ],
    "importance": 10,
    "canonical_url": "https://themachinepress.com/story/mp-2026-10-28-002/a-radio-circle-spans-two-million-light-years",
    "json_url": "https://themachinepress.com/story/mp-2026-10-28-002.json",
    "first_published_at": "2026-10-28T09:00:00.000-04:00",
    "modified_at": "2026-10-28T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-10-28-002-001",
        "text": "ASKAP data reveal a faint 0.63-megaparsec ring around the brightest galaxy in Abell 3639, placing ORC J1928-5056 among the largest single odd radio circles known.",
        "source_ids": [
          "source-2026-10-28-002"
        ],
        "qualification": "Odd radio circles are faint, roughly circular radio structures whose origins remain unsettled."
      }
    ],
    "source_ids": [
      "source-2026-10-28-002"
    ],
    "tags": [
      "astronomy",
      "radio telescope",
      "galaxy clusters",
      "odd radio circles"
    ],
    "image_url": "https://themachinepress.com/issues/2026-10-28/feature-giant-odd-radio-circle.png",
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-10-28-002",
      "title": "arXiv preprint 2610.36512, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2610.36512v1",
      "canonical_url": "https://arxiv.org/abs/2610.36512v1",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-10-26T20:00:00.000-04:00",
      "accessed_at": "2026-10-28T08:24:14.982-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-10-28-002-001"
      ]
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  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "A Radio Circle Spans Two Million Light-Years",
    "publisher": "The Machine Press",
    "published_at": "2026-10-28T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-10-28-002/a-radio-circle-spans-two-million-light-years"
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}