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JWST NIRSpec Isotopic Measurements Suggest 3I/ATLAS May Be ~12 Billion Years Old

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Summary

JWST used its NIRSpec (Near-Infrared Spectrograph) instrument to observe 3i-atlas as it departed the Solar System, yielding isotopic measurements published in Nature on June 22, 2026 (“Isotopic evidence for a cold and distant origin of 3I/ATLAS”). NIRSpec detected deuterium levels nearly 30× higher than solar-system comets — corroborating earlier MDM/ALMA D/H work (src-3i-atlas-heavy-water-2026-05) via a different instrument — and unusually low carbon-13 relative to carbon-12. This depleted ¹³C/¹²C signature arises because carbon-13 enrichment occurs within stellar systems over time; scarcity places 3I/ATLAS’s formation as far back as roughly 12 billion years ago, during “cosmic noon” — the universe’s peak star-formation epoch. ESO’s Very Large Telescope complemented the JWST observations, confirming carbon content and detecting cyanide-bound nitrogen. Note on age discrepancy: An Oxford orbital analysis (src-3i-atlas-oxford-age-2026-06) gives a best estimate of ~7 billion years; the two methods — isotopic abundance (JWST) vs. trajectory modeling — are different approaches and the discrepancy is unresolved as of June 2026.

Key Claims

  • JWST NIRSpec detected deuterium enrichment ~30× above solar-system comets, corroborating the earlier MDM/ALMA D/H result via a different instrument and approach.
  • Low ¹³C/¹²C ratio indicates 3I/ATLAS formed before significant stellar carbon processing — suggesting origin as far back as ~12 billion years ago (“cosmic noon”).
  • High deuterium reflects irradiation of deuterium-rich ice never thermally reset during billions of years of interstellar drift.
  • ESO Very Large Telescope complemented JWST: detected carbon content and nitrogen (as cyanide).
  • Paper: “Isotopic evidence for a cold and distant origin of 3I/ATLAS,” Nature, June 22, 2026.
  • Lead scientists Martin Cordiner and Stefanie Milam, both NASA Goddard Space Flight Center.
  • Stefanie Milam connected the data to prebiotic chemistry and the universality of life’s conditions across the galaxy.

Notable Quotes

“A unique opportunity to study an ancient object from the distant galaxy, probably pre-dating our Sun and solar system.” — Martin Cordiner, NASA Goddard

“For us as scientists, finding these rare isotopes is fascinating, but the bigger picture here is looking at prebiotic chemistry elsewhere in the galaxy.” — Stefanie Milam

“Analysis of these interstellar objects is a major step towards learning how common, or uncommon, the conditions for the evolution of life are in the universe.” — Stefanie Milam

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