# Heavy hydrogen in 3I/ATLAS's methane points to a frigid birthplace

- Source: Phys.org - latest science and technology news stories
- Published: 2026-11-01T15:20:02+00:00
- Category: Science
- Original: https://phys.org/news/2026-10-heavy-hydrogen-3iatlas-methane-frigid.html
- Canonical: https://groundlevelnews.com/story/heavy-hydrogen-in-3i-atlas-s-methane-points-to-a-frigid-birthplace-428445/

The interstellar comet 3I/ATLAS carries a chemical clue to conditions in the planetary system of its origin, locked away long before it reached our sun. Its methane signature is unusually rich in heavy hydrogen, suggesting that the comet's frozen ingredients took shape in an intensely cold environment around another star—or in the cloud that preceded it.

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