THE ANCIENT ENGINE: NASA Just Dated 3I/ATLAS to Before the Sun Existed
Sentinel argues that two independent observational teams found unusually old isotopic signatures in 3I/ATLAS, while later chemistry and mass-budget analysis raise questions about a conventional comet interpretation.
RELATED ENTITIES
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Source Claims
7- Source reportedObserved
The article states that JWST measurements found an unusually high deuterium-to-hydrogen ratio in 3I/ATLAS water vapor.
NASA’S JWST just read the expiration date on 3I.
- Source reportedAsserted
The article states that Cordiner’s team used galactic chemical evolution models to estimate an age of roughly 10 to 12 billion years for the source material associated with 3I/ATLAS. 
Cordiner’s team ran the numbers through galactic chemical evolution models. The age: 10 to 12 billion years old.
- Source reportedAsserted
The article says a second team led by Cyrielle Opitom reported a consistent result using different observations and molecular tracers.
The day after Cordiner published, that team showed up. The paper. Led by Cyrielle Opitom at the University of Edinburgh.
- Source reportedAsserted
The outbound chemical profile of 3I does not match the inbound profile.
The outbound chemical profile does not match the inbound profile.
- Source reportedAsserted
The outbound iron and nickel production rates are roughly ten times higher than those measured at comparable distances during the inbound approach.
The outbound iron and nickel production rates are roughly ten times higher than those measured at comparable distances during the inbound approach.
- Source reportedAsserted
C2 was absent during the entire approach and materialized during the retreat at concentrations high enough to reclassify the object.
C2 was absent during the entire approach. It materialized during the retreat at concentrations high enough to reclassify the object.
- InterpretationAsserted
The article cites Avi Loeb’s argument that the proposed source population for 3I/ATLAS faces a major mass-budget shortfall.
Avi Loeb read the isotope papers from Part One and asked the question nobody else had put in print.
Structure Across Time
How the key people and organizations in this source are involved as events unfold. Built from the extracted timeline — co-appearance here reflects the source’s narrative, not verified coordination.
Cordiner et al. paper published
The article cites publication of Cordiner et al.’s isotope analysis on 3I/ATLAS. 
Expected Jupiter Hill Sphere crossing
The article states that 3I/ATLAS was expected to cross into Jupiter’s Hill Sphere around this date. 
Post-perihelion tracking begins
The article says tracking of 3I/ATLAS behavior after perihelion began in December. 
Source Material
5Source Documents
4Deep probes
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The Sentinel Network · May 4Research Map
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The Sentinel Network