Summary
The official NASA Science write-up of JWST NIRSpec findings on 3i-atlas as it departed the Solar System, published June 22, 2026 alongside the Nature paper “Isotopic evidence for a cold and distant origin of 3I/ATLAS.” martin-cordiner (NASA Goddard) led the study; stefanie-milam (NASA Goddard) co-investigated. NIRSpec detected deuterium levels ~30× above solar-system comets and a strongly depleted ¹³C/¹²C ratio, placing 3I/ATLAS’s formation 10–12 billion years ago during “cosmic noon” — the universe’s peak star-formation epoch. A complementary ESO Very Large Telescope study led by cyrielle-opitom (University of Edinburgh) analyzed carbon and nitrogen as cyanide, supporting the JWST results. This is the primary-source companion to the secondary coverage in src-3i-atlas-jwst-isotopic-age-2026-06.
Key Claims
- NIRSpec detected deuterium ~30× higher than solar-system comets, consistent with formation in an extremely cold early-galactic environment (Cordiner / NASA Webb Mission Team)
- Low ¹³C/¹²C ratio implies formation before significant stellar nuclear processing — suggesting origin ~10–12 billion years ago (Cordiner)
- Earth’s higher ¹³C reflects the Sun forming relatively recently, 4.5 billion years ago (paper)
- ESO VLT complementary study (cyrielle-opitom, University of Edinburgh) analyzed carbon and nitrogen varieties as cyanide, corroborating JWST findings (Opitom)
- Webb’s NIRSpec required an approved interruption of the telescope’s regular observation schedule to capture 3I/ATLAS as it warmed near perihelion (NASA)
- Milam framed findings in terms of prebiotic chemistry: Earth’s Solar System is the only known place where chemical ingredients led to life, making interstellar objects a key probe of life’s universality (Milam)
Notable Quotes
“This was a unique opportunity to study an ancient object from the distant galaxy, probably pre-dating our Sun and solar system.” — Martin Cordiner, NASA Goddard
“We know of only one place in the vast cosmos where chemical ingredients led to life – our solar system, our Earth.” — Stefanie Milam, NASA Goddard