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  "data": {
  "id": "deadly-voyager",
  "title": "Deadly Voyager: The Ancient Comet Strike That Changed Earth and Human History",
  "description": {
    "en": "James Lawrence Powell's 2020 Powell Books work — the principal accessible scholarly synthesis of the Younger Dryas Impact Hypothesis (YDIH) evidence accumulated since Firestone et al.'s 2007 *PNAS* paper. Powell, a geochemist and former president of the Franklin Institute and Reed College, synthesises the substantial accumulated evidence (platinum spikes, nanodiamonds, carbon spherules, widespread combustion markers, megafaunal extinctions, Clovis-culture collapse) for a major cosmic impact or atmospheric airburst event at approximately 12,900 BCE. The YDIH remains contested in mainstream geology; Powell's work is the principal recent advocacy synthesis."
  },
  "authored_by": [
    "James Lawrence Powell"
  ],
  "topics": [
    "Younger Dryas",
    "Impact Hypothesis",
    "Late Pleistocene",
    "Catastrophism"
  ],
  "stance": "neutral",
  "source_type": "academic_monograph",
  "publish_date": "2020",
  "source_family": "science",
  "relation_to_wheel": "scientific_context",
  "licensing_status": "licensed",
  "follow_url": "https://www.amazon.com/Deadly-Voyager-Ancient-Strike-Changed/dp/1734341505"
},
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}