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THE ANCIENT ENGINE: NASA Just Dated 3I/ATLAS to Before the Sun Existed

Two teams. Two continents. Two instruments. Same answer. The chemistry transformed at perihelion. Then Harvard ran the mass budget: the universe doesn't have enough material to create this thing.

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Key Claims

7
Factual6Interpretation1
  • NASA's JWST measured the deuterium-to-hydrogen ratio in 3I's water vapor as D/H = 0.95 percent.factual
    NASA’S JWST just read the expiration date on 3I.
  • Cordiner’s team ran the numbers through galactic chemical evolution models and determined 3I is 10 to 12 billion years old.factual
    Cordiner’s team ran the numbers through galactic chemical evolution models. The age: 10 to 12 billion years old.
  • Opitom's team confirmed Cordiner's findings using a different instrument and molecules.factual
    The day after Cordiner published, that team showed up. The paper. Led by Cyrielle Opitom at the University of Edinburgh.
  • The outbound chemical profile of 3I does not match the inbound profile.factual
    The outbound chemical profile does not match the inbound profile.
  • The outbound iron and nickel production rates are roughly ten times higher than those measured at comparable distances during the inbound approach.factual
    The outbound iron and nickel production rates are roughly ten times higher than those measured at comparable distances during the inbound approach.
  • C2 was absent during the entire approach and materialized during the retreat at concentrations high enough to reclassify the object.factual
    C2 was absent during the entire approach. It materialized during the retreat at concentrations high enough to reclassify the object.
  • Avi Loeb claims the mass budget for 3I does not close, suggesting a factor of a thousand shortfall in the proposed source population.interpretation
    Avi Loeb read the isotope papers from Part One and asked the question nobody else had put in print.

Evidence

5
JWST NIRSpec measurementsNASA Goddard
data
Cordiner et al. 2026 paperMartin Cordiner at NASA Goddard
paper
Opitom et al. 2026 paperCyrielle Opitom at the University of Edinburgh
paper
Zhao et al. 2026 paperChinese Academy of Sciences and Yunnan Observatories
paper
Loeb 2026 paperAvi Loeb, Harvard
paper

Event timeline

3
March 6

Cordiner et al. paper published

Cordiner's team published their results on 3I's D/H ratio.

March 16th

3I/ATLAS crosses into Jupiter’s Hill Sphere

3I/ATLAS is expected to cross into Jupiter’s Hill Sphere.

December

Tracking of 3I's post-perihelion behavior

Tracking of 3I's behavior after perihelion began.